Attachment Page A...Stafford, VA 22554 U 7/26/2007 AIC-AAA Laurence W. Caraway, Jr. Principal Kitchen Klean Inc. AirDuct Clean 27 Black Hall Road PO Box 754 Epsom, NH 03234 National

Meeting Agenda

Air Conditioning Technical Committee February 8-10, 2010

Doubletree Hotel Nashville - Downtown Nashville, TN

1. Call to Order. Call Meeting to order by Chair David Demers at 8:00 a.m. on Monday, February 8, 1010 at the Doubletree Hotel Nashville – Downtown, Nashville, TN.

2. Introduction of Attendees. (For a current committee roster see attachment “A”,

pg. 02.)

3. Chair’s Remarks – David Demers.

4. Staff Comments – Allan Fraser.

5. Approval of Minutes of the September 25-26 2007 meeting. (For a copy of the meeting minutes see attachment” B”, pg. 06.

6. Review of Public and Committee Proposals (Attachment C, pg.12 ) for the June,

2011 editions of:

a. NFPA 90A – 79 public proposals were received.

b. NFPA 90B – 13 public proposals were received.

7. Other Business.

8. Date and Location of Next Meeting.

9. Adjournment. Attachments

Page 1 of 75

AGENDA ATTACHMENT A

Page 2 of 75

Address List No PhoneAir Conditioning AIC-AAA

Allan Fraser1/6/2010

AIC-AAADavid P. DemersChairDemers Associates Inc.42 Highland StreetLunenburg, MA 01462

SE 7/29/2005AIC-AAA

Charles E. AltizerPrincipalVirginia State Fire Marshal’s OfficeVirginia Department of Fire Programs1005 Technology Park DriveGlen Allen, VA 23059-4500International Fire Marshals Association

E 7/1/1993

AIC-AAAJesse J. BeitelPrincipalHughes Associates, Inc.3610 Commerce Drive, Suite 817Baltimore, MD 21227-1652

SE 4/16/1999AIC-AAA

James S. BuckleyPrincipalJacobs5985 Rogerdale RoadHouston, TX 77072American Society for Heating, Refrigeration & AirConditioning Engineers Inc.

IM 1/17/1997

AIC-AAAMerton W. Bunker, Jr.PrincipalUS Department of StateOverseas Buildings Operations22 Gray Birch CourtStafford, VA 22554

U 7/26/2007AIC-AAA

Laurence W. Caraway, Jr.PrincipalKitchen Klean Inc.AirDuct Clean27 Black Hall RoadPO Box 754Epsom, NH 03234National Air Duct Cleaners Association

IM 3/21/2006

AIC-AAAMichael Earl DillonPrincipalDillon Consulting Engineers, Inc.671 Quincy AvenueLong Beach, CA 90814-1818Alternate: Diane B. Copeland

SE 1/1/1980AIC-AAA

James T. Dollard, Jr.PrincipalIBEW Local Union 981701 Spring Garden StreetPhiladelphia, PA 19130International Brotherhood of Electrical WorkersAlternate: Harold C. Ohde

L 7/14/2004

AIC-AAADouglas S. EricksonPrincipalAmerican Society for Healthcare EngineeringPO Box 1074Christiansted, VI 00821American Society for Healthcare EngineeringAlternate: Kimball E. Ferguson

U 1/1/1986AIC-AAA

Thomas P. HammerbergPrincipalAutomatic Fire Alarm Association, Inc.14 Sammy McGhee Boulevard, #103PO Box 1569Jasper, GA 30143Automatic Fire Alarm Association, Inc.Alternate: David L. Hall

M 10/27/2005

AIC-AAAJ. C. HarringtonPrincipalFM Global1151 Boston Providence TurnpikePO Box 9102Norwood, MA 02062-9102

I 10/27/2005AIC-AAA

Marcelo M. HirschlerPrincipalGBH International2 Friar’s LaneMill Valley, CA 94941American Fire Safety Council/Plenum Cable Assn.Alternate: Vijay Kotian

M 10/3/2002

1Page 3 of 75



AIC-AAACharles C. HoltPrincipalNational Energy Management InstituteHeimann RoadPO Box 32Mammoth, PA 15664Sheet Metal Workers’ International Association

L 11/2/2006AIC-AAA

Michael J. JontryPrincipalIllinois Department of Public Health525 West Jefferson StreetSpringfield, IL 62761

E 4/17/2002

AIC-AAAStanley D. KahnPrincipalTri-City Electric Company, Inc.532 Vista Del Mar DriveAptos, CA 95003-4816National Electrical Contractors Association

IM 9/30/2004AIC-AAA

Marvin A. KoerberPrincipalATCO Rubber Products Inc.584 Crooked RoadAbbeville, SC 29620Air Diffusion CouncilAlternate: Ralph A. Koerber

M 1/1/1985

AIC-AAAWilliam E. KoffelPrincipalKoffel Associates, Inc.6522 Meadowridge Road, Suite 101Elkridge, MD 21075Society of the Plastics Industry, Inc.

M 11/2/2006AIC-AAA

Richard E. LoydPrincipalR & N Associates24623 South Rocky Brook DriveSun Lakes, AZ 85248-6593American Iron and Steel InstituteAlternate: Robert J. Wills

M 7/28/2006

AIC-AAATimothy J. OrrisPrincipalAMCA International, Inc.30 West University DriveArlington Heights, IL 60004-1893Air Movement & Control AssociationAlternate: Robert Van Becelaere

M 10/27/2005AIC-AAA

Richard P. OwenPrincipal7421 Upper 24th Street NorthOakdale, MN 55128-4197National Electrical Code Correlating Committee

E 4/3/2003

AIC-AAAThomas E. PonderPrincipalCertainTeed Corporation1400 Union Meeting RoadBlue Bell, PA 19422North American Insulation Manufacturers AssociationAlternate: Charles C. Cottrell

M 1/1/1990AIC-AAA

Suresh K. ShahPrincipalUS Department of Health & Human ServicesIndian Health ServicesEngineering Services-Dallas1301 Young Street, Suite 1071Dallas, TX 75202

U 4/28/2000

AIC-AAADwayne E. SloanPrincipalUnderwriters Laboratories Inc.12 Laboratory DrivePO Box 13995Research Triangle Park, NC 27709-3995Alternate: Randall K. Laymon

RT 4/14/2005AIC-AAA

George A. StranieroPrincipalTyco/AFC Cable Systems, Inc.106 Village Center DriveFreehold, NJ 07728National Electrical Manufacturers AssociationAlternate: Isaac I. Papier

M 9/30/2004

2Page 4 of 75



AIC-AAARandolph W. TuckerPrincipalThe RJA Group, Inc.Executive Vice President13831 Northwest Freeway, Suite 330Houston, TX 77040Alternate: Brian J. Papagni

SE 4/1/1996AIC-AAA

Robert A. WesselPrincipalGypsum Association6525 Belcrest Road, Suite 480Hyattsville, MD 20782

M 4/17/1998

AIC-AAAEli P. Howard, IIIVoting AlternateSheet Metal & Air Conditioning Contractors Natl. Assn.4201 Lafayette Center DriveChantilly, VA 20151-1209Voting Alt. to SMACNA Rep.

IM 7/22/1999AIC-AAA

Michael J. RzeznikVoting AlternateAon/Schirmer Engineering Corporation50 Main Street, Suite 1000White Plains, NY 10606Voting Alt. to Aon/Schirmer Rep.

I 10/23/2003

AIC-AAADiane B. CopelandAlternateDillon Consulting Engineers, Inc.671 Quincy AvenueLong Beach, CA 90814-1818Principal: Michael Earl Dillon

SE 4/15/2004AIC-AAA

Charles C. CottrellAlternateNorth American Insulation Manufacturers Assn.44 Canal Center Plaza, Suite 310Alexandria, VA 22314Principal: Thomas E. Ponder

M 10/27/2009

AIC-AAAKimball E. FergusonAlternateInova Health System3300 Gallows RoadFalls Church, VA 22042American Society for Healthcare EngineeringPrincipal: Douglas S. Erickson

U 7/23/2008AIC-AAA

David L. HallAlternateAir Products and Controls Inc.1749 East HighwoodPontiac, MI 48340Automatic Fire Alarm Association, Inc.Principal: Thomas P. Hammerberg

M 7/28/2006

AIC-AAARalph A. KoerberAlternateATCO Rubber Products, Inc.Research & Development7101 ATCO DriveFort Worth, TX 76118Air Diffusion CouncilPrincipal: Marvin A. Koerber

M 4/17/2002AIC-AAA

Vijay KotianAlternateAlbermarle Corporation451 Florida BoulevardBaton Rouge, LA 70801American Fire Safety Council/Plenum Cable Assn.Principal: Marcelo M. Hirschler

M 7/26/2007

AIC-AAARandall K. LaymonAlternateUnderwriters Laboratories Inc.333 Pfingsten RoadNorthbrook, IL 60062-2096Principal: Dwayne E. Sloan

RT 7/12/2001AIC-AAA

Harold C. OhdeAlternateIBEW-NECA Technical Institute9318 South Longwood AvenueChicago, IL 60643International Brotherhood of Electrical WorkersPrincipal: James T. Dollard, Jr.

L 7/14/2004

3Page 5 of 75



AIC-AAABrian J. PapagniAlternateThe RJA Group, Inc.3384 Peachtree Road NE, Suite 550Atlanta, GA 30326Principal: Randolph W. Tucker

SE 3/4/2009AIC-AAA

Isaac I. PapierAlternateHoneywell, Inc.Honeywell Life Safety3825 Ohio AvenueSt. Charles, IL 60174-5465National Electrical Manufacturers AssociationPrincipal: George A. Straniero

M 10/27/2005

AIC-AAARobert Van BecelaereAlternateRuskin Manufacturing3900 Dr. Greaves RoadGrandview, MO 64030Air Movement & Control AssociationPrincipal: Timothy J. Orris

M 1/10/2002AIC-AAA

Robert J. WillsAlternateAmerican Iron and Steel Institute907 Spyglass CircleBirmingham, AL 35244-2252Principal: Richard E. Loyd

M 1/1/1992

AIC-AAAAllan FraserStaff LiaisonNational Fire Protection Association1 Batterymarch ParkQuincy, MA 02169-7471

6/9/2003

4Page 6 of 75

AGENDA ATTACHMENT B

Page 7 of 75

MEETING MINUTES OF THE

TECHNICAL COMMITTEE ON AIR CONIDITIONING ROC Meeting

September 25-26, 2007 Opryland Hotel Nashville, TN

Item 1, Call to Order

The ROC meeting of the Technical Committee on Air Conditioning was convened by the Chair, David Demers at 8:00 a.m. on Tuesday, September 25, 2007. Item 2, Introduction of Members and Guests

The Chair opened the meeting with welcoming remarks. The Chair provided a general overview of the agenda and opening remarks.

Self-introductions of meeting participants and guests were conducted on each day at the beginning of the session.

The following Technical Committee Principal and Alternate members participated:

Present NAME COMPANY 9/25 9/26

Principals: David Demers, Principal (Chair) Demers Associates Inc. X X Jesse J. Beitel, Principal Hughes Associates, Inc. X X Michael Earl Dillon, Principal Dillon Consulting Engineers, Inc. X X James T. Dollard, Jr., Principal International Brotherhood of

Electrical Workers (IBEW) X X

Thomas Hammerberg, Principal Automatic Fire Alarm Assoc., Inc. X X John Harrington, Principal FM Global X X Marcelo M. Hirschler, Principal GBH International representing:

American Fire Safety Council/Plenum Cable Assn.

X X

Charles Holt, Principal Steel Workers’ International X X Michael J. Jontry, Principal State of Illinois, Department of

Public Health X X

Stanley D. Kahn, Principal Tri-City Electric Company, Inc. Representing National Electrical

Contractors Assoc. (NECA)

X X

Richard Loyd, Principal American Iron & Steel Institute X X Richard P. Owen, Principal City of St. Paul representing:

National Electrical Code Correlating Committee

X X

Suresh K. Shah, Principal US Department of Health & Human X X

Page 8 of 75

Technical Committee on Air Conditioning - ROC Meeting September 25-26, 2007 Page 2

2

Services, Indian Health Services Dwayne Sloan, Principal Underwriters Laboratories Inc. X X George A. Straniero, Principal AFC Cable Systems Representing:

National Electrical Manufacturers Assoc. (NEMA)

X X

Randolph W. Tucker, Principal The RJA Group. X X Alternates:

Diane B. Copeland, Alt. to Dillon

Dillon Consulting Engineers, Inc. X X

David Hall, Alt. to Hammerberg Automatic Fire Alarm Assoc., Inc X X Ralph A. Koerber, Alt. to M. Koerber

ATCO Rubber Products Inc. Representing: Air Diffusion Council

X X

William Koffel, Alt. to Weidman Society of the Plastics Industry, Inc X X Vijay Kotian, Alt. to Hirschler American Fire Safety

Council/Plenum Cable Assn

Randall Laymon, Alt. to D. Sloan

Underwriters Laboratories Inc. X X

Harold C. Ohde, Alt. to Dollard IBEW X X Issac Papier, Alt. to G. Straneiro National Electrical Manufacturers

Assoc. (NEMA) X X

Thomas E. Ponder, Alt.to W. Irwin

Certain Teed Corporation rep: North American Insulation Manufacturers

Association

X X

Michael J. Reznik, Alt. to Dusza Schirmer Engineering Corporation X X Robert Van Becelaere, Alt. to Orris

Ruskin Manufacturing representing Air Movement & Control Assn/HVI

Division

X X

Principals Not Attending: Charles E. Altizer, Principal DHCD-Jackson Center rep:

International Fire Marshals Association

Merton W. Bunker, Principal U.S. Department of State Laurence Caraway, Principal National Air Duct Cleaners Assoc. Doug Erickson, Principal American Society for Healthcare

Engineering

Victor Ferrante, Principal US Dept. of Housing and Urban Development

Robert Wasilewski, Principal Sheet Metal & Air Conditioning Contractors National Assoc.

Robert A. Wessel, Principal Gypsum Association

Page 9 of 75


3

Guests Present: Patricia Horton – Steel Tube Institute of North America Ray Miller – Hoover Treated Wood Products, Inc. Sam Nave-Corning The following NFPA staff participated:

Allan Fraser Item 3, Staff Comments Allan Fraser gave a short “Powerpoint” presentation on the NFPA Codes & Standards process and the specific process for the ROC phase. Item 4, Approval of Minutes The Committee approved the minutes of the Feb. 13-15, 2007 ROP meeting as written. Item 5 There were no Public Comments received for NFPA 90B NFPA 90B will be sent directly to the Standards Council for issuance as a consensus document. Item 6, Review of Public Comments for NFPA 90A The committee reviewed and acted on fifty (50) public comments and developed five (5) committee comments to 90A.The committee actions on comments were sent out with a letter ballot for formal action by the TC members. Item 7, Task Groups: The following task groups were appointed at the ROP meeting by acting Chair Isman:

Task Group #1 was charged with looking at the concept of “duct distribution plenum” and various other existing or potential definitions of “sub-plenums” and reporting their recommendations, if any, back to the full committee, through staff, in time for distribution to the full committee prior to the ROC meeting in the fall. The task group is chaired by Jesse Beitel and includes Tom Ponder, Charles Holt, Jim Dollard, and Dwayne Sloan. This task group reported that they had not been able to complete the work and Chair Demers instructed the group to continue with the work and to have it ready for the ROP meeting for the next cycle which will be held sometime between December, 2009 and February, 2010.

Task Group #2 was charged with looking at the issue of “abandoned material” and reporting their recommendations, if any, back to the full committee, through staff, in time for distribution

Page 10 of 75


4

to the full committee prior to the ROC meeting in the fall. The task group is chaired by Jim Dollard and includes Ralph Koerber and Marcelo Hirschler. Jim Dollard reported that the group concluded that there is no action necessary by the committee. The chair thanked Mr. Dollard and the task group. The committee voted to disband this task group. Chair Demers appointed two additional task groups for the duration of the ROC meeting. The first to look at Log #s definitions Item 8, Retiring Formal Interpretations: The committee voted to retire the following Formal Interpretations and directs that they are no longer to be printed in future editions of NFPA 90A: The committee based these actions on there findings that changes that have been made to NFPA 90A that have rendered them no longer applicable or that have clearified the issues involved.

1. F.I. 78-1: Issue Edition: 1978, Reference: 90A, Date: June 1979

2. F.I. 81-5: Issue Edition: 1981, Reference: Entire Document, Date: March 1984

3. F.I. Reference: 1.3: Issue Edition: 1975, Reference: 1-1(a), Date: October - November 1976

4. F.I. No.: 90A-02-1: Reference: 2.3.9.2, Issue Edition: 2002, Reference: Paragraph 2-

3.9.2, Issue Date: December 31, 2002, Effective Date: January 20, 2003

5. F.I. Reference: 4.3.1: Issue Edition: 1975, Reference: 2-1.1, Date: October - November 1976

6. F.I. 81-4: Reference: 4.3.1.2, Issue Edition: 1981, Reference: 2-1.1.1(b), Date: March

1984

7. F.I. 81-6: Reference: 4.3.11.1, Issue Edition: 1981, Reference: 2-2.2, Date: March 1984

8. F.I. Reference: 5.3.4, 5.3.4.6: Issue Edition: 1975, Reference: 3-3.3.1, 3-3.3.3, Date: October - November 1976

9. F.I. 89-1: Reference: 5.3.4.4, Issue Edition: 1989, Reference: 3-3.4.2, Issue Date: January

3, 1990, Effective Date: January 23, 1990 10. F.I. Reference: 5.3.4.6: Issue Edition: 1976, Reference: 3-3.3, Exception No. 2, Date:

June - July 1977 Item 9, Next Meeting (ROC)

Page 11 of 75


5

No date or location was set for the ROC meeting although it will likely be held the end of September, 2007. Staff will notify the committee ASAP after a decision has been made. Item 10, Adjournment. On Thursday, February 15, 2007, the meeting was adjourned at 5:00 pm by the acting Chair, Ken Isman. Minutes prepared by Allan B. Fraser, CBI, CPCA, NFPA Staff Liaison

Page 12 of 75

AGENDA ATTACHMENT C

Page 13 of 75

Report on Proposals – June 2011 NFPA 90A_______________________________________________________________________________________________90A- Log #30

_______________________________________________________________________________________________Marcelo M. Hirschler, GBH International / Rep. American Fire Safety Council

Revise text to read as follows:

1.2 Purpose.This standard shall prescribe minimum requirements for safety to life and property from fire. These requirements shall

be intended to accomplish the following:(1) Restrict the spread of smoke through air duct systems within a building or into a building from the outside(2) Restrict the spread of fire through air duct systems from the area of fire origin, whether located within the

building or outside(3) Maintain the fire-resistive integrity of building components and elements such as floors, partitions, roofs, walls,

and floor- or roof-ceiling assemblies affected by the installation of air duct systems(4) Minimize the ignition sources and combustibility of the elements of the air duct systems(5) Permit the air duct systems in a building to be used for the additional purpose of emergency smoke control3.3.3* Air Connector. A conduit for transferring air between an air duct or plenum and an air terminal unit or an air

inlet or air outlet.3.3.4 Air Distribution System. A continuous passageway for the transmission of air that, in addition to air ducts, can

include air connectors, air duct fittings, dampers, plenums, fans, and accessory air-handling equipment but that does notinclude conditioned spaces.

3.3.5 Air Duct. A conduit or passageway for conveying air to or from heating, cooling, air conditioning, or ventilatingequipment, but not including the plenum.

3.3.6 Air Duct Covering. A material such as an adhesive, insulation, banding, a coating(s), film, or a jacket used tocover the outside surface of an air duct, fan casing, or duct plenum.

3.3.7 Air Duct Lining. A material such as an adhesive, insulation, a coating(s), or film used to line the inside surface ofan air duct, fan casing, or duct plenum.

3.3.22* Plenum. A compartment or chamber to which one or more air ducts are connected and that forms part of theair distribution system.

4.2.4.2.2 Unlisted solar energy air distribution system components shall be accompanied by supportive informationdemonstrating that the components have flame spread and smoke developed indexes that are not in excess of those ofthe air duct system permitted by this standard.

4.2.4.3.1 Mechanical refrigeration used with air duct systems shall be installed in accordance with recognized safetypractices.

4.2.4.4.1 Oil-burning heating furnaces combined with cooling units in the same air duct system shall be installed inaccordance with NFPA 31, Standard for the Installation of Oil-Burning Equipment.

4.2.4.4.2 Gas-burning heating furnaces combined with cooling units in the same air duct system shall be installed inaccordance with NFPA 54, National Fuel Gas Code.

4.2.4.5.1 Where electrical resistance or fuel-burning heaters are installed in air ducts, the air duct coverings and theirinstallation shall comply with the provisions of 4.3.5.3.

4.3.1 Air Ducts.4.3.1.1 Air Ducts shall be constructed of iron, steel, aluminum, copper, concrete, masonry, or clay tile, except as

otherwise permitted in 4.3.1.2 or 4.3.1.3.4.3.1.2 Class 0 or Class 1 rigid or flexible air ducts tested in accordance with ANSI/UL 181, Standard for Safety

Factory-Made Air Ducts and Air Connectors, and installed in conformance with the conditions of listing shall bepermitted to be used for ducts when air temperature in the ducts does not exceed 121°C (250°F) or when used asvertical ducts serving not more than two adjacent stories in height.

4.3.1.3 Gypsum Board Air Ducts.4.3.1.3.2 The air temperature limits of 4.3.1.3.1 shall not apply when gypsum board material is used for emergency

smoke exhaust air ducts.4.3.1.4 All air duct materials shall be suitable for continuous exposure to the temperature and humidity conditions of

the environmental air in the air duct.4.3.1.5.1 Air ducts Ducts shall be considered to be in compliance with this requirement where constructed and

installed in accordance with the ASHRAE Handbook — HVAC Systems and Equipment, and with one of the following asapplicable:

1Printed on 1/6/2010Page 14 of 75

Report on Proposals – June 2011 NFPA 90A(1) NAIMA Fibrous Glass Duct Construction Standard(2) SMACNA Fibrous Glass Duct Construction Standard(3) SMACNA HVAC Duct Construction Standards — Metal and Flexible(4) SMACNA HVAC Air Duct Leakage Test Manual4.3.1.6 Where no standard exists for the construction of air ducts, the ducts shall be constructed to withstand both the

maximum positive and negative pressures of the system at fan shutoff.4.3.2.1 Air connectors are limited-use, flexible air ducts that shall not be required to conform to the provisions for air

ducts where they meet the requirements of 4.3.2.1.1 through 4.3.2.1.5.4.3.3.1* Pipe and duct insulation and coverings, duct linings, vapor retarder facings, adhesives, fasteners, tapes, and

supplementary materials added to air ducts, plenums, panels, and duct silencers used in duct systems, unless otherwiseprovided for in 4.3.3.1.1 or 4.3.3.1.2, shall have, in the form in which they are used, a maximum flame spread index of25 without evidence of continued progressive combustion and a maximum smoke developed index of 50 when tested inaccordance with ASTM E 84, Standard Test Method for Surface Burning Characteristics of Building Materials, or withANSI/UL 723, Standard Test Method for Surface Burning Characteristics of Building Materials. Pipe and duct insulationand coverings, duct linings and their adhesives, and tapes shall use the specimen preparation and mounting proceduresof ASTM E 2231, Standard Practice for Specimen Preparation and Mounting of Pipe and Duct Insulation Materials toAssess Surface Burning Characteristics.

4.3.3.1.1 The flame spread index and smoke developed index requirements of 4.3.3.1 shall not apply to air ductweatherproof coverings where they are located entirely outside of a building, do not penetrate a wall or roof, and do notcreate an exposure hazard.

4.3.3.2 Closure systems for use with rigid and flexible air ducts tested in accordance with ANSI/UL 181, Standard forSafety Factory-Made Air Ducts and Air Connectors, shall have been tested, listed, and used in accordance with theconditions of their listings, in accordance with one of the following:

(1) ANSI/UL 181A, Standard for Safety Closure Systems for Use with Rigid Air Ducts(2) ANSI/UL 181B, Standard for Safety Closure Systems for Use with Flexible Air Ducts and Air Connectors4.3.3.3 Coverings and linings for air ducts, pipes, plenums, and panels, including all pipe and duct insulation materials,

shall not flame, glow, smolder, or smoke when tested in accordance with ASTM C 411, Standard Test Method forHot-Surface Performance of High-Temperature Thermal Insulation, at the temperature to which they are exposed inservice. In no case shall the test temperature be below 121°C (250°F).

4.3.3.4 Air duct Duct coverings shall not extend through walls or floors that are required to be fire stopped or requiredto have a fire resistance rating, unless such coverings meet the requirements of NFPA 80, Standard for Fire Doors andOther Opening Protectives.

4.3.3.5* Air duct Duct linings shall be interrupted at fire dampers to prevent interference with the operation of devices.4.3.3.6 Air duct Duct coverings shall not be installed so as to conceal or prevent the use of any service opening.4.3.4.1* Wiring shall not be installed in air ducts, except as permitted in 4.3.4.2 through 4.3.4.4.4.3.4.2 Wiring shall be permitted to be installed in air ducts, only if the wiring is directly associated with the air

distribution system and does not exceed 1.22 m (4 ft).4.3.5 Air Duct Access and Inspection.4.3.5.1 A service opening shall be provided in air ducts adjacent to each fire damper, smoke damper, and any smoke

detectors that need access for installation, cleaning, maintenance, inspection, and testing.4.3.5.3 Horizontal air ducts and plenums shall be provided with service openings to facilitate the removal of

accumulations of dust and combustible materials.4.3.5.3.1 Service openings shall be located at approximately 6.1 m (20 ft) intervals along the air duct and at the base

of each vertical riser, unless otherwise permitted in 4.3.5.3.2 through 4.3.5.3.4.4.3.5.4 Inspection windows shall be permitted in air ducts, provided they are glazed with wired glass.4.3.5.5 Openings in walls or ceilings shall be provided so that service openings in air ducts are accessible for

maintenance and inspection needs.4.3.5.6 Where a service opening is necessary in an air duct located above the ceiling of a floor- or roof-ceiling

assembly that has been tested and assigned a fire resistance rating in accordance with NFPA 251, Standard Methods ofTests of Fire Resistance of Building Construction and Materials, access shall be provided in the ceiling.

4.3.6 Air Duct Integrity.4.3.6.1 Air ducts Ducts shall be located where they are not subject to damage or rupture, or they shall be protected to

maintain their integrity.4.3.6.2 Where an air duct is located outdoors, the air duct, together with its covering or lining, shall be protected from

harmful elements.4.3.6.3 Where electrical, fossil fuel, or solar energy collection heat sources are installed in air ducts, the installation

shall avoid the creation of a fire hazard.


Report on Proposals – June 2011 NFPA 90A4.3.6.3.1 For air ducts rated as Class 1 in accordance with ANSI/UL 181, Standard for Safety Factory-Made Air Ducts

and Air Connectors, air duct coverings and linings shall be interrupted at the immediate area of operation of such heatsources in 4.3.5.3 in order to meet the clearances specified as a condition of the equipment listing, unless otherwisepermitted in 4.3.5.3.2 or 4.3.5.3.3.

4.3.11.2.6.8 Air ducts Ducts complying with 4.3.1.2 and air connectors complying with 4.3.2 shall be permitted.4.3.11.3.2 Fabricated plenum and apparatus casing shall be constructed of materials and by methods specified in

4.3.1 and in accordance with the following:(1) The casing and plenum construction standards in SMACNA HVAC Duct Construction Standards — Metal and

Flexible(2) ASHRAE Handbook — HVAC Systems and Equipment(3) Subsection 4.3.3 for all air duct coverings, duct lining, acoustical liner/cells, and miscellaneous materials4.3.11.5.5.7 Air ducts Ducts complying with 4.3.1.2 and air connectors complying with 4.3.2 shall be permitted.5.1.1 General. Air-handling equipment rooms shall be classified into the following three categories:(1) Those used as air plenums (usually return air)(2) Those with air ducts that open directly into a shaft(3) Other air-handling unit rooms5.1.3 Air-Handling Equipment Rooms That Have Air Ducts That Open Directly into a Shaft.5.2.1 Air Duct Clearance.5.2.1.1 The clearance from metal air ducts used for heating to assemblies constructed of combustible materials,

including plaster on wood lath, shall be not less than 12.7 mm (½ in.), or the combustible material shall be protected withminimum 6.35 mm (¼ in.)–thick approved insulating material.

5.2.2 Structural Members. The installation of air ducts, including the hangers, shall not reduce the fire resistancerating of structural members.5.2.3 Ceiling Assemblies. Where the installation of the hangers for the components of an air duct system penetrates

an existing ceiling of a fire-resistive floor- or roof-ceiling assembly and necessitates removal of a portion of that ceiling,the replacement material shall be identical to that which was removed, or shall be approved as equivalent to that whichwas removed.

5.2.4 As an alternative to repairing the existing ceiling, a new ceiling shall be permitted to be installed below the airduct system, provided the fire resistance rating of the floor- or roof-ceiling design is not reduced.

5.3.1.1* Approved fire dampers shall be provided where air ducts penetrate or terminate at openings in walls orpartitions required to have a fire resistance rating of 2 hours or more.5.3.2.1 Where air ducts extend through only one floor and serve only two adjacent stories, the air ducts shall beenclosed (see 5.3.4.1), or fire dampers shall be installed at each point where the floor is penetrated.

5.3.3.1 Where air ducts and openings for air ducts are used in a floor- or roof-ceiling assembly that is required to havea fire resistance rating, all the materials and the construction of the assembly, including the air duct materials and thesize and protection of the openings, shall conform with the design of the fire-resistive assembly, as tested in accordancewith NFPA 251, Standard Methods of Tests of Fire Resistance of Building Construction and Materials.

5.3.4.1 Air ducts Ducts that pass through the floors of buildings that require the protection of vertical openings shall beenclosed with partitions or walls constructed of materials as permitted by the building code of the authority havingjurisdiction, as indicated in 5.3.4.2 or 5.3.4.3, unless otherwise permitted by 5.3.4.3.1.

5.3.4.2 The shaft enclosure shall have a minimum fire resistance rating (based on possible fire exposure from eitherside of the partition or wall) of 1 hour where such air ducts are located in a building less than four stories in height.

5.3.4.3 The shaft enclosure shall have a minimum fire resistance rating (based on possible fire exposure from eitherside of the partition or wall) of 2 hours where such air ducts are located in a building four stories or more in height.

5.3.4.3.1 Where an air duct penetrates only one floor, or one floor and an air-handling equipment penthouse floor, andthe air duct contains a fire damper located where the duct penetrates the floor, an air duct enclosure shall not berequired.

5.3.4.4 A fire-resistive enclosure used as an air duct shall conform with 4.3.1 and 5.3.4.2 through 5.3.4.3.5.3.4.5 Shafts that constitute air ducts or that enclose air ducts used for the movement of environmental air shall not

enclose the following:(1) Exhaust ducts used for the removal of smoke- and grease-laden vapors from cooking equipment(2) Ducts used for the removal of flammable vapors(3) Ducts used for moving, conveying, or transporting stock, vapor, or dust(4) Ducts used for the removal of nonflammable corrosive fumes and vapors(5) Refuse and linen chutes(6) Piping, except for noncombustible piping conveying water or other nonhazardous or nontoxic materials(7) Combustible storage


Report on Proposals – June 2011 NFPA 90A5.3.4.6.1 A fire damper shall not be required where an air duct system serving only one story is used only for exhaust

of air to the outside and is contained within its own dedicated shaft.5.3.5.1 Smoke dampers shall be installed at or adjacent to the point where air ducts pass through required smoke

barriers, but in no case shall a smoke damper be installed more than 0.6 m (2 ft) from the barrier, or after the first airduct inlet or outlet, whichever is closer to the smoke barrier, unless otherwise permitted by 5.3.5.1.1 through 5.3.5.1.5.

5.4.5.2.2.1* Where combination fire and smoke dampers are located within air ducts that are part of an engineeredsmoke-control system, fusible links or other approved heat-responsive devices shall have a temperature ratingapproximately 28°C (50°F) above the maximum smoke-control system designed operating temperature.

5.4.5.4* Dampers shall close against the maximum calculated airflow of that portion of the air duct system in whichthey are installed.

5.4.6.1 The locations and mounting arrangement of all fire dampers, smoke dampers, ceiling dampers, and fireprotection means of a similar nature required by this standard shall be shown on the drawings of the air duct systems.

5.4.6.2 Dampers required to close in airflow shall have the calculated airflow at their location shown on the drawings ofthe air duct system.

6.4.4.3 Where smoke detectors required by Section 6.4 are installed in a building not equipped with an approved firealarm system as specified by 6.4.4.2, the following shall occur:

(1) Smoke detector activation required by Section 6.4 shall cause a visual signal and an audible signal in anormally occupied area.

(2) Smoke detector trouble conditions shall be indicated visually or audibly in a normally occupied area and shallbe identified as air duct detector trouble.

A.1.1 An air duct system has the potential to convey smoke, hot gases, and flame from area to area and to supply airto aid combustion in the fire area. For these reasons, fire protection of an air duct system is essential to safety to life andthe protection of property. However, an air duct system's fire integrity also enables it to be used as part of a building'sfire protection system.

Guidance for the design of smoke-control systems is provided in NFPA 92A, Standard for Smoke-Control SystemsUtilizing Barriers and Pressure Differences.

A.3.3.3 Air Connector. Some such devices are listed in UL Heating, Cooling, Ventilating and Cooking EquipmentDirectory under the category “Connectors (ALNR).” These devices, since they do not meet all the requirements for airducts, have limitations on their use, length, and location. (For limitations on the use of air connectors, see 4.3.2.1.)

A.6.3 The dampers should close as quickly as practicable, subject to requirements of the system fan and air ductcharacteristics. The designer should evaluate whether the smoke dampers normally should be open or closed andshould consider the fail-safe position of the dampers during an event such as a power failure.

A.6.3.2 Within the scope of this document, smoke dampers reduce the possibility of smoke transfer within ductwork orthrough wall openings. Activation of smoke dampers can be by area detectors that are installed in the related smokecompartment or by detectors that are installed in the air duct systems. See NFPA 72, National Fire Alarm Code.

A.6.4 The use of smoke detectors in relationship to HVAC systems and high air movement areas and the detailsregarding their optimum installation are covered in Section 5.7 of NFPA 72, National Fire Alarm Code.

Protection provided by the installation of smoke detectors and related requirements is intended to prevent thedistribution of smoke through the supply air duct system and, preferably, to exhaust a significant quantity of smoke tothe outside. Neither function, however, guarantees either the early detection of fire or the detection of smokeconcentrations prior to dangerous smoke conditions where smoke movement is other than through the supply airsystem.

Where smoke-control protection for a facility is determined to be needed, see NFPA 92A, Standard for Smoke-ControlSystems Utilizing Barriers and Pressure Differences.

A.6.4.2 The summation of the capacities of individual supply-air fans should be made where such fans are connectedto a common supply air duct system (i.e., all fans connected to a common air duct supply system should be consideredas constituting a single system with respect to the applicability of the Chapter 6 provisions that are dependent on systemcapacity).

B.1.1 Owners should develop a greater awareness of the life and property protection abilities of air-conditioningsystems and should establish a planned maintenance schedule. Failure to maintain proper conditions of cleanliness inair duct systems and carelessness in connection with repair operations have been important contributing causes ofseveral fires that have involved air-conditioning systems. The recommendations in this annex apply, in general, to theperiod of operation of the system; systems operating only part of the year should be given a thorough general checkupbefore starting operation and again after a shutdown.

This brings consistency with the NEC, which talks about ducts and plenums and not about air ducts.The entire standard addresses air distribution systems. Moreover, there is inconsistency within the standard nowbecause some sections talk about ducts and some talk about air ducts but they mean the same.


Report on Proposals – June 2011 NFPA 90A

_______________________________________________________________________________________________90A- Log #32


Revise text to read as follows:C.1.2.2 ASTM Publications. ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA

19428-2959.ASTM E 84, Standard Test Method for Surface Burning Characteristics of Building Materials, 2006a 2009c .ASTM E 2231, Standard Practice for Specimen Preparation and Mounting of Pipe and Duct Insulation Materials to

Assess Surface Burning Characteristics, 2002 2009 .Standards update

_______________________________________________________________________________________________90A- Log #CP10

_______________________________________________________________________________________________Technical Committee on Air Conditioning,

Review entire document to: 1) Update any extracted material by preparing separate proposals to doso, and 2) review and update references to other organizations documents, by preparing proposal(s) as required.

To conform to the NFPA Regulations Governing Committee Projects.

_______________________________________________________________________________________________90A- Log #53

_______________________________________________________________________________________________Joshua Elvove, U.S. General Services Administration

Revise text to read as follows:Revise 1.1 as follows:

This standard shall cover construction, installation, operation, and maintenance of systems for air conditioning andventilating, including filters, ducts, and related equipment, to protect life and property from fire, smoke, and gasesresulting from fire or from conditions having manifestations similar to fire. The standard does not cover maintenance offire dampers, ceiling dampers, smoke dampers and combination fire/smoke dampers.

Add new text to A.1.1 as follows:Maintenance of fire dampers, ceiling dampers, smoke dampers and combination fire/smoke dampers requirements can

be found in other NFPA standards.NFPA 80 is now responsible for inspection, testing and maintenance of fire and ceiling dampers;

NFPA 105 is now responsible for inspection, testing and maintenance of smoke dampers; and both NFPA 80 and NFPA105 address inspection, testing and maintenance of combination fire/smoke dampers. As such, any discussion ofinspection, testing and maintenance of fire damper, smoke dampers, or combination fire/smoke dampers should bereferred to the respective standard. Note: I recognize that Section 5.4.8 already addresses this, but it would be better ifthe scope addressed at the beginning of this standard (in fact, Section 5.4.8 could even be deleted in favor of locatingthis text in Section 1.1 and it’s annex.



_______________________________________________________________________________________________David Handwork, Arkansas State University Facilities Management / Rep. APPA.ORG - Association of

Education Facilities ExecutivesNew text to read as follows:

Add NFPA 79 to the list of referenced publications as shown below:2.2 NFPA Publications. National Fire Protection Association, 1 Batterymarch Park, Quincy, MA 02169-7471.NFPA 30, Flammable and Combustible Liquids Code, 2008 edition.NFPA 31, Standard for the Installation of Oil-Burning Equipment, 2006 edition.NFPA 54, National Fuel Gas Code, 2009 edition.NFPA 70®, National Electrical Code®, 2008 edition.NFPA 72®, National Fire Alarm Code®, 2007 edition.NFPA 75, Standard for the Protection of Information Technology Equipment, 2009 edition.

NFPA 80, Standard for Fire Doors and Other Opening Protectives, 2007 edition.NFPA 101®, Life Safety Code®, 2009 edition.NFPA 105, Standard for the Installation of Smoke Door Assemblies and Other Opening Protectives, 2007 edition.NFPA 251, Standard Methods of Tests of Fire Resistance of Building Construction and Materials, 2006 edition.NFPA 259, Standard Test Method for Potential Heat of Building Materials, 2008 edition.NFPA 262, Standard Method of Test for Flame Travel and Smoke of Wires and Cables for Use in Air-Handling Spaces,

2007 edition.NFPA 286, Standard Methods of Fire Tests for Evaluating Contribution of Wall and Ceiling Interior Finish to Room Fire

Growth, 2006 edition.®, 2009 edition.

The scope statement of NFPA 79, as shown below, would seem to apply to the control systems forHVAC systems. Extract from NFPA 79:

Many HVAC control systems are at least as complicated as industrial process control systems. This proposal issubmitted to correlate with another proposal APPA.ORG has submitted to this committee during this ROP cycle toreduce electrical risk in HVAC control cabinets. Reference to NFPA 79 in NFPA 90A strengthens the interoperability ofthe entire suite of NFPA leading safety practice documents.

_______________________________________________________________________________________________90A- Log #33


Revise text to read as follows:2.3.2 ASTM International Publications.ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959.ASTM C 411, Standard Test Method for Hot-Surface Performance of High-Temperature Thermal Insulation, 1997 2005

.ASTM D 93, Standard Test Methods for Flashpoint by Pensky-Martens Closed Cup Tester, 2006 2008 .ASTM E 84, Standard Test Method for Surface Burning Characteristics of Building Materials, 2006a 2009c .ASTM E 136, Standard Test Method for Behavior of Materials in a Vertical Tube Furnace at 750°C, 2004 2009a .ASTM E 2231, Standard Practice for Specimen Preparation and Mounting of Pipe and Duct Insulation Materials to

Assess Surface Burning Characteristics, 2007 2009 .Standards update





Standards update



_______________________________________________________________________________________________Bob Eugene, Underwriters Laboratories Inc.

2.3.6 UL Publications.Underwriters Laboratories Inc., 333 Pfingsten Road, Northbrook, IL 60062-2096.ANSI/UL 181, Standard for Safety Factory-Made Air Ducts and Air Connectors, 2005, Revised 2008.ANSI/UL 181A, Standard for Safety Closure Systems for Use with Rigid Air Ducts, 2005, Revised 2008.ANSI/UL 181B, Standard for Safety Closure Systems for Use with Flexible Air Ducts and Air Connectors, 2005,

Revised 2008.ANSI/UL 555, Standard for Safety Fire Dampers, 2006, Revised 2009.ANSI/UL 555C, Standard for Safety Ceiling Dampers, 2006, Revised 2009.ANSI/UL 555S, Standard for Safety Smoke Dampers, 2006 1999, Revised 2009.ANSI/UL 723, Standard Test Method for Surface Burning Characteristics of Building Materials, 2003 2008.ANSI/UL 867, Standard for Safety Electrostatic Air Cleaners, 2004 2000, Revised 2007.ANSI/UL 900, Standard for Safety Air Filter Units, 2004, Revised 2009.ANSI/UL 1820, Standard for Safety Fire Test of Pneumatic Tubing for Flame and Smoke Characteristics, 2004,

Revised 2009.ANSI/UL 1887, Standard for Safety Fire Test of Plastic Sprinkler Pipe for Visible Flame and Smoke Characteristics,

2004, Revised 2009.ANSI/UL 1995, Standard for Safety Heating and Cooling Equipment, 2003, revised 2005, Revised 2008.ANSI/UL 2024, Standard for Optical-Fiber and Communications Cable Raceway, 2004, Revised 2007.ANSI/UL 2043, Standard for Safety Fire Test for Heat and Visible Smoke Release for Discrete Products and Their

Accessories Installed in Air-Handling Spaces, 1996, revised 2001 2008.Update referenced standards to most recent revisions. Add ANSI approval designation to UL 2043.

_______________________________________________________________________________________________90A- Log #36


New text to read as follows:3.3.x Continued progressive combustion. A flame front progressing more than 10.5 ft (3.2 m) beyond the centerline of

the burners at some time during a 30 minute test in accordance with ASTM E 84 or ANSI/UL 723.The concept of “evidence of continued progressive combustion” has never been defined and is usually

interpreted by labs as meaning that the flame front in the ASTM E 84 tunnel does not exceed 10.5 ft during the 30minute test. This provides a definition.

NFPA 703 (and building codes) address the following: “a flame spread of 25 or less, and shows no evidence ofsignificant progressive combustion when the test is continued for an additional 20-minute period; nor does the flamefront progress more than 10.5 ft (3.2 m) beyond the centerline of the burners at any time during the test.” In fact, the “noevidence of significant progressive combustion”, which is undefined is simply taken to mean that the flame front doesnot progress more than 10.5 ft during the 30 minute test.


Report on Proposals – June 2011 NFPA 90A_______________________________________________________________________________________________90A- Log #CP2


Adopt the preferred definition from the NFPA Glossary of Terms as follows:. Having access to but which first may requires the removal of a panel, door, or similar covering of the

item described. [ , 2009]

This definition is the preferred definition from the Glossary of Terms. Changing the secondarydefinition to the preferred definition complies with the Glossary of Terms Project.

_______________________________________________________________________________________________90A- Log #CP3


Adopt the preferred definition from the NFPA Glossary of Terms as follows:A device used to reduce or remove airborne solids from heating, ventilating, and air-conditioning

systems. ( , 2009)This definition is the preferred definition from the Glossary of Terms. Changing the secondary

definition to the preferred definition complies with the Glossary of Terms Project.

_______________________________________________________________________________________________90A- Log #CP4


Adopt the preferred definition from the NFPA Glossary of Terms as follows:A system that is intended for the purpose of smoke control only, which

are separate systems of air moving and distribution equipment that do not function under normal building operatingconditions. [ , 2009]


_______________________________________________________________________________________________90A- Log #CP5


Adopt the preferred definition from the NFPA Glossary of Terms as follows:A listed device installed in a ceiling membrane of a fire resistance-rated

floor-ceiling or roof-ceiling assembly to automatically limit the radiative heat transfer through an air inlet/outlet opening.[ , 2009]





Revise the definition of “Ceiling Radiation Damper” in 3.3.13.1 as follows:A listed device installed in a ceiling membrane of a fire resistance-rated

floor-ceiling or roof ceiling assembly to automatically limit the radiant radiative heat transfer through an air outlet or airinlet/outlet opening. [ , 2009] in the ceiling of a floor- or roof-ceiling assembly having not less than a 1-hour fireresistance rating. Such a device is described in the construction details for some tested floor- or roof-ceiling assemblies.

Some such devices are listed in UL under thecategory of “Ceiling Damper (CABS).”

The definition for ceiling radiation damper should be consistent between the standard that requires itsinstallation (NFPA 90A) and the standard that requires its maintenance (NFPA 80), given it’s the same piece ofequipment. The proposed definition comes from NFPA 80 (which basically comes from NFPA 5000). If the NFPA 90Acommittee has an issue with this definition, suggest they reconcile this with the NFPA 80 committee. Note: the NFPAmanual of style doesn’t permit performance criteria within a definition, hence, the language regarding “not less than 1hour” should be stricken anyway (performance criteria belongs in Chapter 5).

_______________________________________________________________________________________________90A- Log #57


Revise definition of “Fire Damper” in 3.3.13.3 as follows:A device, installed in an air distribution system, designed to close automatically upon

detection of heat, to interrupt migratory airflow, and to restrict the passage of flame. [ , 2009] Fire dampers areclassified for use in either static systems or for dynamic systems, where the dampers are rated for closure under airflow.[ , 2009]

Some such devices are listed in ULunder the category of “Fire Dampers for Fire Barrier and Smoke Applications (EMME).”

The definition for fire damper should be consistent between the standard that requires its installation(NFPA 90A) and the standard that requires its maintenance (NFPA 80), given it’s the same piece of equipment. Theproposed definition comes from NFPA 80 (which basically comes from NFPA 221) and simply adds the secondsentence from the definition of fire damper in NFPA 80. If the NFPA 90A committee has an issue with this definition,suggest they reconcile this with the NFPA 80 committee.

_______________________________________________________________________________________________90A- Log #CP6


Adopt the preferred definition from the NFPA Glossary of Terms as follows:A blower or exhauster assembly comprising blades or runners and housings or casings. [ 2006]





Revise text to read as follows:3.3.16* Fire Resistance Rating. The time, in minutes or hours, that materials or assemblies have withstood a fire

exposure as established in accordance with the test procedures of NFPA 251, Standard Methods of Tests of FireResistance of Building Construction and Materials, ASTM E 119, Standard Test Methods for Fire Tests of BuildingConstruction and Materials, or ANSI/UL 263, Standard for Fire Tests of Building Construction and Materials .

4.3.5.6 Where a service opening is necessary in an air duct located above the ceiling of a floor- or roof-ceilingassembly that has been tested and assigned a fire resistance rating in accordance with NFPA 251, Standard Methods ofTests of Fire Resistance of Building Construction and Materials, ASTM E 119, Standard Test Methods for Fire Tests ofBuilding Construction and Materials, or ANSI/UL 263, Standard for Fire Tests of Building Construction and Materials,access shall be provided in the ceiling.

5.3.3.1 Where air ducts and openings for air ducts are used in a floor- or roof-ceiling assembly that is required to havea fire resistance rating, all the materials and the construction of the assembly, including the air duct materials and thesize and protection of the openings, shall conform with the design of the fire-resistive assembly, as tested in accordancewith NFPA 251, Standard Methods of Tests of Fire Resistance of Building Construction and Materials, ASTM E 119,Standard Test Methods for Fire Tests of Building Construction and Materials, or ANSI/UL 263, Standard for Fire Tests ofBuilding Construction and Materials.

NFPA codes and standards, including NFPA 101, recognize ASTM E 119 and UL 263 as alternateacceptable tests for assessing fire resistance rating.




Revise text to read as follows:3.3.20* Limited-Combustible (Material). Refers to a building construction material not complying with the definition of

noncombustible material that, in the form in which it is used, has a potential heat value not exceeding 3500 Btu/lb (8141kJ/kg), where tested in accordance with NFPA 259, Standard Test Method for Potential Heat of Building Materials, andincludes either of the following: (1) materials having a structural base of noncombustible material, with a surfacing notexceeding a thickness of 1/8 in. (3.2 mm) that has a flame spread index not greater than 50; and (2) materials, in theform and thickness used, having neither a flame spread index greater than 25 and a flame front progressing no morethan 10.5 ft (3.2 m) in a 30 minute test nor evidence of continued progressive combustion, and of such composition thatsurfaces that would be exposed by cutting through the material on any plane would have neither a flame spread indexgreater than 25 nor a flame front progressing no more than 10.5 ft (3.2 m) in a 30 minute test evidence of continuedprogressive combustion, when tested in accordance with ASTM E 84, Standard Test Method of Surface BurningCharacteristics of Building Materials, or ANSI/UL 723 Standard Test Method for Surface Burning Characteristics ofBuilding Materials.

4.3.1.3.1 Gypsum board having a maximum flame spread index of 25 and a flame front progressing no more than 10.5ft (3.2 m) in a 30 minute test without evidence of continued progressive combustion and a maximum smoke developedindex of 50 when tested in accordance with ASTM E 84, Standard Test Method for Surface Burning Characteristics ofBuilding Materials, or ANSI/UL 723, Standard Test Method for Surface Burning Characteristics of Building Materials,shall be permitted to be used for negative pressure exhaust and return ducts where the temperature of the conveyed airdoes not exceed 52°C (125°F) in normal service.

4.3.3.1* Pipe and duct insulation and coverings, duct linings, vapor retarder facings, adhesives, fasteners, tapes, andsupplementary materials added to air ducts, plenums, panels, and duct silencers used in duct systems, unless otherwiseprovided for in 4.3.3.1.1 or 4.3.3.1.2, shall have, in the form in which they are used, a maximum flame spread index of25 and a flame front progressing no more than 10.5 ft (3.2 m) in a 30 minute test without evidence of continuedprogressive combustion and a maximum smoke developed index of 50 when tested in accordance with ASTM E 84,Standard Test Method for Surface Burning Characteristics of Building Materials, or with ANSI/UL 723, Standard TestMethod for Surface Burning Characteristics of Building Materials. Pipe and duct insulation and coverings, duct liningsand their adhesives, and tapes shall use the specimen preparation and mounting procedures of ASTM E 2231,Standard Practice for Specimen Preparation and Mounting of Pipe and Duct Insulation Materials to Assess SurfaceBurning Characteristics.

4.3.11.2.6.9 Materials that, in the form in which they are used, have a potential heat value not exceeding 8141 kJ/kg(3500 Btu/lb), where tested in accordance with NFPA 259, Standard Test Method for Potential Heat of BuildingMaterials, and include either of the following:

(1) Materials having a structural base of noncombustible material, with a surfacing not exceeding a thickness of3.2 mm (1/8 in.) that has a flame spread index not greater than 50

(2) Materials, in the form and thickness used, having neither a flame spread index greater than 25 and a flamefront progressing no more than 10.5 ft (3.2 m) in a 30 minute test nor evidence of continued progressive combustion ,and of such composition that surfaces that would be exposed by cutting through the material on any plane would haveneither a flame spread index greater than 25 and a flame front progressing no more than 10.5 ft (3.2 m) in a 30 minutetest nor evidence of continued progressive combustion , when tested in accordance with ASTM E 84, Standard TestMethod of Surface Burning Characteristics of Building Materials, or ANSI/UL 723, Standard Test Method of SurfaceBurning Characteristics of Building Materials.

4.3.11.5.5.8 Materials that, in the form in which they are used, have a potential heat value not exceeding 3500 Btu/lb(8141 kJ/kg), where tested in accordance with NFPA 259, Standard Test Method for Potential Heat of BuildingMaterials, and include either of the following:

(1) Materials having a structural base of noncombustible material, with a surfacing not exceeding a thickness of1/8 in. (3.2 mm) that has a flame spread index not greater than 50

(2) Materials, in the form and thickness used, having neither a flame spread index greater than 25 and a flamefront progressing no more than 10.5 ft (3.2 m) in a 30 minute test nor evidence of continued progressive combustion,and of such composition that surfaces that would be exposed by cutting through the material on any plane would haveneither a flame spread index greater than 25 and a flame front progressing no more than 10.5 ft (3.2 m) in a 30 minutetest nor evidence of continued progressive combustion , when tested in accordance with ASTM E 84, Standard Test


Report on Proposals – June 2011 NFPA 90AMethod of Surface Burning Characteristics of Building Materials, or ANSI/UL 723, Standard Test Method for SurfaceBurning Characteristics of Building Materials.

The concept of “evidence of continued progressive combustion” has never been defined and is usuallyinterpreted by labs as meaning that the flame front in the ASTM E 84 tunnel does not exceed 10.5 ft during the 30minute test.

NFPA 703 (and building codes) address the following: “a flame spread of 25 or less, and shows no evidence ofsignificant progressive combustion when the test is continued for an additional 20-minute period; nor does the flamefront progress more than 10.5 ft (3.2 m) beyond the centerline of the burners at any time during the test.” In fact, the “noevidence of significant progressive combustion”, which is undefined is simply taken to mean that the flame front doesnot progress more than 10.5 ft during the 30 minute test.

_______________________________________________________________________________________________90A- Log #CP7


Adopt the preferred definition from the NFPA Glossary of Terms as follows:Refers to a building construction material not complying with the definition of

noncombustible that, in the form in which it is used, has a potential heat value not exceeding 8141 kJ/kg (3500 Btu/lb),where tested in accordance with NFPA 259 and includes either (1) materials having a structural base of noncombustiblematerial, with a surfacing not exceeding a thickness of 3.2 mm (1/8 in.) that has a flame spread index not greater than50, or (2) materials, in the form and thickness used having neither a flame spread index greater than 25 nor evidence ofcontinued progressive combustion, and of such composition that surfaces that would be exposed by cutting through thematerial on any plane would have neither a flame spread index greater than 25 nor evidence of continued progressivecombustion, when tested in accordance with UL 723 or ASTM E 84. ( , 2009)


_______________________________________________________________________________________________90A- Log #17


Revise text to read as follows:3.3.21* Noncombustible Material. A material that, in the form in which it is used and under the conditions anticipated,

will not ignite, burn, support combustion, or release flammable vapors, when subjected to fire or heat. Materials that arereported as passing ASTM E 136, Standard Test Method for Behavior of Materials in a Vertical Tube Furnace at 750Degrees C, shall be considered noncombustible materials.[220, 2009]

A.3.3.21 A material that is reported as complying with the pass/fail criteria of ASTM E 136 when tested in accordancewith the test method and procedure in ASTM E 2652, Standard Test Method for Behavior of Materials in a Tube Furnacewith a Cone-shaped Airflow Stabilizer, at 750 Degrees C, is considered a noncombustible material.

The definition proposed is consistent with that in NFPA 220, Standard on Types of BuildingConstruction, 2009 edition. The proposed definition will be extracted from NFPA 220, 2009 edition. The annex note isbeing added because the equipment for ASTM E 136 is virtually unavailable and therefore ASTM E 2652 has beendeveloped as an alternate apparatus and is presented as an option. This has already been addressed in several otherdocuments, including NFPA 101, 5000 and draft NFPA 556.


Report on Proposals – June 2011 NFPA 90A_______________________________________________________________________________________________90A- Log #CP8


Adopt the preferred definition from the NFPA Glossary of Terms as follows:A material that, in the form in which it is used and under the conditions anticipated,

will not ignite, burn, support combustion, or release flammable vapors, when subjected to fire or heat. Materials that arereported as passing ASTM E 136 Standard Test Method for Behavior of Materials in a Vertical Tube Furnace at 750Degrees C, shall be are considered noncombustible materials. [ 2009]


_______________________________________________________________________________________________90A- Log #CP9


Adopt the preferred definition from the NFPA Glossary of Terms as follows:A continuous membrane, or a membrane with discontinuities created by protected openings,

where such membrane is designed and constructed to restrict the movement of smoke. [ 2009]This definition is the preferred definition from the Glossary of Terms. Changing the secondary

definition to the preferred definition complies with the Glossary of Terms Project.

_______________________________________________________________________________________________90A- Log #58


Revise the definition of “Smoke Barrier” in 3.3.24 and revise corresponding annex note A.3.3.24. asfollows:

A continuous membrane, or a member with discontinuities created by protected openings,where such member either vertical or horizontal, such as a wall, floor, or ceiling assembly, that is designed andconstructed to restrict the movement of smoke.

A smoke barriers might be vertically or horizontally aligned, such as a wall, floor or ceilingassembly. A smoke barrier might or might not have a fire resistance rating. See also NFPA , ,Chapter 8, for additional guidance.

The definition for smoke barrier should be consistent between NFPA documents that utilize the term.The proposed definition comes from NFPA 101 which is the same as the definition in NFPA 5000. If the NFPA 90Acommittee has an issue with this definition, suggest they reconcile this with the NFPA 101 committee. Note: the NFPAmanual of style doesn’t permit lists (i.e,. using the term “such as” in a definition); hence, relocating this text to the annexis more appropriate.




Education Facilities ExecutivesNew text to read as follows:

Add the following text to Chapter 4Moving parts, such as shafts, pulleys, couplings and belts, installed within air

ducts that are accessible for maintenance, shall be protected with metal guards that enclose all moving parts.The danger posed by moving parts -- especially the belts associated with driven equipment within

large, walk-in air ducts -- ought to be self evident. This is a borderline product-standard/field-installation issue that oughtto be addressed in both product and installation standards for HVAC equipment. This is a first step for covering it in aninstallation standard even if it means field fabrication of guarding. Hopefully, manufacturers will take a cue from thisrequirement and build it into the cost of the product.

_______________________________________________________________________________________________90A- Log #2

_______________________________________________________________________________________________Jonathan Paul, Lebanon Fire Dept.

New text to read as follows:(New paragraph 4.2.4.1.3): Window air-conditioning units shall only be used for listed use.

Numerous improper installations of window air-conditioning are found on inspection of buildings. Inparticular, computer server rooms are being cooled by window air-conditioning units instead of thru the wall units orcentral air. These window units are being found exhausting into wall spaces, closets and attics, presenting a possiblefire hazard.

Air-conditioning manufacturer’s that I have spoken to have stated that such installations void all warranties and safetyfeatures.

_______________________________________________________________________________________________90A- Log #19



To get language consistent with other equivalent sections.




Revise text to read as follows:4.3.1.5.1 Air ducts shall be considered to be in compliance with this requirement where constructed and installed in

accordance with the ASHRAE Handbook — HVAC Systems and Equipment, and with one of the following as applicable:(1) NAIMA Fibrous Glass Duct Construction Standards(2) SMACNA Fibrous Glass Duct Construction Standard(3) SMACNA HVAC Duct Construction Standards — Metal and Flexible(4) SMACNA HVAC Air Duct Leakage Test ManualA.4.3.3.5 See NAIMA Fibrous Glass Duct Liner Standard, and NAIMA Fibrous Glass Duct Construction Standards

and NAIMA Residential Fibrous Glass Duct Construction Standards for additional information.Corrects title and correlates with references

_______________________________________________________________________________________________90A- Log #18



UL 2024 is used for testing and listing all types of raceways, including optical fiber raceways,communications raceways, signaling raceways, fire alarm raceways. CATV raceways when they are to be used inplenums. The critical issue is that the raceway has been tested and listed to UL 2024 and it is important to eliminatepotential language problems. The change in nomenclature does not change the requirements.




Revise text to read as follows:4.3.2 Air Connectors.4.3.2.1 Air connectors are limited-use, flexible air ducts that shall not be required to conform to the provisions for air

ducts where they meet the requirements of 4.3.2.1.1 through 4.3.2.1.5.4.3.2.1.1 Air connectors shall conform to the requirements for Class 0 or Class 1 connectors when tested in

accordance with ANSI/UL 181, Standard for Safety Factory-Made Air Ducts and Air Connectors.4.3.2.1.2 Class 0 or Class 1 air connectors shall not be used for ducts containing air at temperatures in excess of

121°C (250°F).4.3.2.1.3 Air connector runs shall not exceed 4.27 m (14 ft) in length.4.3.2.1.4 Air connectors shall not pass through any wall, partition, or enclosure of a vertical shaft that is required to

have a fire resistance rating of 1 hour or more.4.3.2.1.5 Air connectors shall not pass through floors.4.3.2.2 Vibration isolation connectors in duct systems shall be made of an approved flame-retardant fabric or shall

consist of sleeve joints with packing of approved material, each having a maximum flame spread index of 25 and amaximum smoke developed index of 50.

4.3.2.2 Vibration isolation connectors in duct systems shall be made of materials having a maximum flame spreadindex of 25 and a maximum smoke developed index of 50.

4.3.2.3 Approved flame-retardant fabric Unlisted vibration isolation connectors complying with 4.3.2.2 having amaximum length of 254 mm (10 in.) in the direction of airflow shall be permitted to be used.

4.3.2.4 Wiring shall not be installed in air connectors.Vibration isolation connectors need to be made of materials complying with the same requirements as

other materials in ducts. Even fabrics are being manufactured that meet the ASTM E 84 25/50 requirements.A “flame retardant fabric” is usually taken to mean a fabric that complies with the small-scale test from NFPA 701,

which has been eliminated from that standard for over 10 years. Present versions of NFPA 701 contain two tests(depending on the weight, or areal density of the fabric) but both of them are very much less severe than ASTM E 84and neither one measures smoke. The term “flame retardant fabric” is misleading and has been eliminated from mostNFPA documents.

In fact, this section can be interpreted to consider that the fabrics need to meet both fire tests: NFPA 701 and ASTM E84 with 25/50. This is a clarification, in that case. Fabrics that meet ASTM E 84 with 25/50 need not be tested also toNFPA 701.

Note that the proposal does not require testing of the system and thus allows unlisted combinations of materials testedindividually as long as they are restricted to a maximum length of 10 in.




Education Facilities ExecutivesRevise text to read as follows:

Air connector runs shall not exceed 4.27 1.83 m (14 6 ft) in length.The allowance of 14 ft of flexible duct connectors is excessive in practice for the following reasons:

1. Texas A&M research supported by ASHRAE exhibited flexible ductwork at compression levels over 4% has 2 to 10times the pressure losses over sheet metal (Ref. Weaver – “Static pressure losses in 6”, 8”, and 10” non-metallic flexibleduct” ).

2. Excessive pressure losses will compromise effective air distribution and will dramatically increase fan energy use.3. Flexible ductwork in commercial settings can be more susceptible to damage than rigid duct. Air leaks in punctured

ductwork can be a significant loss in energy and air flow to the conditioned space. Allowing lengths up to 14 ft. increasesthe susceptibility to damage.

4. The energy losses relative to excessive use of flexible ductwork contradicts NFPA 900 – Building Energy Code5. The air flow losses with flexible ductwork can also contradict ASHRAE 62 for adequate airflow to spaces.

Note: Supporting material is available for review at NFPA Headquarters.

_______________________________________________________________________________________________90A- Log #39


New text to read as follows:4.3.3.1.2 Smoke detectors required by 6.4.4 shall not be required to meet flame spread index or smoke developed

index requirements.4.3.3.1.3 Smoke detectors installed in ducts or plenums shall exhibit a maximum peak optical density of 0.5 or less, an

average optical density of 0.15 or less, and a peak heat release rate of 100 kW or less when tested in accordance withUL 2043, Standard for Safety Fire Test for Heat and Visible Smoke Release for Discrete Products and TheirAccessories Installed in Air-Handling Spaces.

4.3.11.2.6.7 Smoke detectors shall comply with the requirements of 4.3.3.1.3 not be required to meet the provisions ofthis section.

4.3.11.5.6 Smoke detectors shall comply with the requirements of 4.3.3.1.3 not be required to meet the requirementsof 4.3.11.5.1.

The standard does not contain any fire safety requirements associated with smoke detectors atpresent. If the smoke detectors are installed in ducts or in plenums they should comply with the requirements of UL2043 just like all other discrete electrical equipment in plenums (see 4.3.11.2.6.5 and 4.3.11.5.5.6). This is probablyalready implied by the plenum sections but needs to be explicitly stated.

_______________________________________________________________________________________________90A- Log #7

_______________________________________________________________________________________________Stanley Kaufman, CableSafe Inc. / Rep. The Society of the Plastics Industry

Revise 4.3.4.2 as shown:Wiring shall be permitted to be installed in air ducts, only if the wiring is directly associated with the air

distribution system and each length of cable exposed to the airflow does not exceed 1.22 m (4 ft).The current text could be interpreted to only permit an aggregate sum of 4 feet of all the cables

exposed to the airflow.


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Revise 4.3.4.4 as shown:Electrical wires and cables and optical fiber cables shall consist of wires or cables listed as having a

maximum peak optical density of 0.50 or less, an average optical density of 0.15 or less, and a maximum flame spreaddistance of 1.5 m (5 ft) or less when tested in accordance with NFPA 262,

, or shall be installed in metal raceways without anoverall nonmetallic covering, or metal sheathed cable without an overall nonmetallic covering,.

Metal raceways can have a combustible nonmetallic jacket and therefore would not be suitable for anapplication exposed to the airflow. Likewise for metal sheathed cables.

_______________________________________________________________________________________________90A- Log #13

_______________________________________________________________________________________________William C. Wagner, Certification Solutions

Revise text to read as follows:4.3.4.4* Electrical wires and cables and optical fiber cables shall be consist of wires or cables listed as having a

maximum peak optical density of 0.50 or less, an average optical density of 0.15 or less, and a maximum flame spreaddistance of 1.5 m (5 ft) or less when tested in accordance with NFPA 262,

, or shall be installed in metal raceways, or metalsheathed cable or Reinforced Thermosetting Resin Conduit (RTRC) listed as having a maximum peak optical density of0.50 or less, an average optical density of 0.15 or less, and a maximum flame spread distance of 1.5 m (5 ft) or lesswhen tested in accordance with NFPA 262,

Paragraph 4.3.4.4 of NFPA 90A currently permits electrical wires and cables and optical fiber cables tobe installed in metal raceways or metal sheathed cable. As an alternative to this, the wires and cables are not requiredto be installed using one of these methods if they themselves comply with the required optical smoke density and flamepropagation requirements specified in NFPA 90A when evaluated in accordance with the Standard Method of Test forFlame Travel and Smoke of Wires and Cables for Use in Air-Handling Spaces, NFPA 262. However, the use of any typeof nonmetallic raceway is not currently permitted.

Recent developments in the formulation of materials which can be utilized in the production of ReinforcedThermosetting Resin Conduit (RTRC) warrant an expansion of the permitted installation methods. Resins for RTRC thatcomply with the identical flame propagation and smoke optical density requirements currently delineated in NFPA 90Afor wires and cables, while still complying with all listing requirements for RTRC, will permit the use of this alternativewire and cable installation method without any increase in flame and smoke hazards.

Therefore, RTRC meeting all of these requirements should be permitted as an acceptable alternative to metalraceways for the installation of electrical wires and cables and optical fiber cables. Compliance with the flamepropagation and optical smoke density requirements of NFPA 262, as well as ASTM E 84, has been confirmed throughindependent testing at Underwriters Laboratories. The inclusion of this type of conduit in NFPA 90A is a necessary firststep toward their eventual listing for this application.




Revise 4.3.5.1 as follows:A service opening shall be provided in air ducts adjacent to each fire damper, smoke damper, combination

fire/smoke damper, and any smoke detectors that need access for installation, cleaning, maintenance, inspection, andtesting.

To ensure that service openings are also provided for combination fire/smoke dampers.

_______________________________________________________________________________________________90A- Log #61


Revise 4.3.5.4 as follows:Inspection windows shall be permitted in air ducts, provided they are glazed with wired or fire protection rated

glass.To permit other appropriate glazing and not limit this to only wire glass.

_______________________________________________________________________________________________90A- Log #28


Revise text to read as follows:4.3.11.6.2.3 The foam plastic insulation material both (a) is separated from the plenum by an approved thermal barrier

consisting of 12.7 mm (0.5 in.) gypsum wallboard or a material that is tested in accordance with and meets theacceptance criteria of both the temperature transmission fire test and the integrity fire test of NFPA 275, StandardMethod of Fire Tests for the Evaluation of Thermal Barriers Used Over Foam Plastic Insulation, equivalent material thatwill limit the average temperature rise of the unexposed surface to not more than 139°C (250°F) after 15 minutes of fireexposure, complying with the standard time-temperature curve of NFPA 251, Standard Methods of Tests of FireResistance of Building Construction and Materials, and (b) exhibits a flame spread index of 75 or less and a smokedeveloped index of 450 or less when tested in accordance with ASTM E 84, Standard Test Method for Surface BurningCharacteristics of Building Materials, or ANSI/UL 723, Standard Test Method for Surface Burning Characteristics ofBuilding Materials, at the maximum thickness intended for use.

The NFPA technical committee on Fire Tests has developed NFPA 275 in order to avoid the vaguelanguage about thermal barriers. NFPA 275 was specifically developed to clarify the two tests for thermal barriermaterials to be used over foam plastic insulation.

The temperature transmission fire test in NFPA 275 uses the ASTM E 119 (or NFPA 251) time-temperature fire curveto expose the thermal barrier specimen and it requires the following: “4.8.1 During the 15-minute test period, theaverage measured temperature rise above the average temperature at the start of the fire test for the thermocouplesdescribed in Section 4.3 shall not exceed 250°F (139°C), and the measured temperature rise of any such singlethermocouple shall not exceed 325°F (181°C).” Therefore, the temperature transmission fire test in NFPA 275corresponds to what the code requires now.

The integrity fire test in NFPA 275 requires that the thermal barrier material, together with the foam plastic insulation,be tested to NFPA 286 (which is a 15 minute test) and that the pass/fail criteria are identical to those used for NFPA 286elsewhere in other codes and standards, including NFPA 90A and NFPA 101.

NFPA 275 also allows the integrity fire test to be conducted in accordance with UL 1040, UL 1715 and FM 4880, withthe pass/fail criteria for those tests.




Add new 4.3.10.2.3 as follows:Smoke dampers shall be installed in systems with a capacity greater than 7080 L/sec (15,000 ft3/min) to

isolate the air-handling equipment, including filters, from the remainder of the system on both the building supply andreturn sides, in order to restrict the circulation of smoke, unless specifically exempted by 4.3.10.2.1 or 4.3.10.2.2.

Air-handling units located on the floor they serve and serving only that floor shall be exempt from therequirements of 4.3.10.2.

Air-handling units located on the roof and serving only the floor immediately below the roof shall be exemptfrom the requirements of 4.3.10.2.

Air handling units located in buildings that are completely sprinkler protected in accordance with NFPA 13,do not require smoke dampers on the return side.

Given the two existing exceptions, it would seem appropriate to allow a third for return air units inbuildings completely protected by sprinkler systems when the sprinkler system has been installed in accordance withNFPA 13, since the likelihood of smoke of any significance in fully sprinklered buildings is minimal. Furthermore, airhandling units of this size already require detection on both the supply and return side which would cause the unit(s) toshut down upon detection of smoke. Hence, whatever little smoke there is would not be recirculated throughout thebuilding. Moreover, smoke from a supply air side filter or motor fire, or from an outside fire would still be prevented fromspreading through the building since the supply side smoke damper is still required.

_______________________________________________________________________________________________90A- Log #CP1


Clarify the text that was the subject of the following Formal Interpretation.Is the intent of the paragraph to require multiple locations for return air in a corridor?

No.Is one point of return air with multiple supply air locations as indicated on the attached sketch

acceptable?Yes.

******INSERT ARTWORK HERE******

The Regulations Governing Committee Projects require that a proposal be processed to clarify the textof a document on which a Formal Interpretation has been issued. After issuance of the next edition of the document, theFormal Interpretation will no longer be published.


Page 52 of 75




This requirement is based on the equivalent requirement in the NEC, which has revised the languageto make the requirement more explicit: abandoned materials must be removed. If cables are present intended for futureuse they need to be appropriately identified for future use with a tag.

The main reason for requiring removal of abandoned materials is for safety of personnel in terms of the potential forabandoned material to fall and/or entangle workers, electrical personnel and firefighters. Note that section 4.3.11.5.8states as follows:

“4.3.11.5.8 The accessible portion of abandoned materials exposed to airflow shall be removed.”

_______________________________________________________________________________________________90A- Log #34


New text to read as follows:4.3.11.2.6 Materials within a ceiling cavity plenum exposed to the airflow shall be noncombustible or comply with one

of the following.4.3.11.2.6.6 Plastic plumbing piping and tubing within a raised floor plenum shall exhibit a maximum peak optical

density of 0.5 or less, an average optical density of 0.15 or less, and a maximum flame spread distance of 1.5 m (5 ft) orless when tested in accordance with ANSI/UL 1887, Standard for Safety Fire Test of Plastic Sprinkler Pipe for VisibleFlame and Smoke Characteristics.

Pipes are installed in ceiling cavity plenums and raised floor plenums today and they comply with theletter of the standard but not with the spirit. They are installed after being tested by means of ASTM E 84, but ASTM E84 does not have a procedure for testing pipes. Consequently the test is being conducted by placing a single pipe in thetunnel, with the ends sealed and full of water. That does not ensure safe materials in plenums. During installation and/ormaintenance or when repairs are being done, or in the event of an incipient fire, any water potentially present in thepipes would drain out and a highly combustible material would cause flame spread in the plenum.

UL 1887 requires testing of pipes without water. The requirements recommended for plastic pipes is the same as thatrequired for sprinkler pipes.

The scope of UL 1887 is limited to sprinkler pipes but it can easily be expanded since the geometry of pipes and ofsprinkler pipes is clearly similar.

_______________________________________________________________________________________________90A- Log #21


New text to read as follows:4.3.11.2.6 Materials within a ceiling cavity plenum exposed to the airflow shall be noncombustible or comply with

4.3.11.2.6.1 through 4.3.11.2.6.9, as applicable one of the following.4.3.11.5.5 Materials within a raised floor plenum exposed to the airflow shall be noncombustible or comply with

4.3.11.5.5.1 through 4.3.11.5.5.8, as applicable.This code proposal just tries to get consistent language between the two sections providing charging

language for plenum content materials. No requirements are being changed.




New text to read as follows:4.3.11.5.5 Materials within a raised floor plenum exposed to the airflow shall be noncombustible or comply with

4.3.11.5.5.1 through 4.3.11.5.5.10 4.3.11.5.5.8, as applicable.4.3.11.5.5.1* Electrical wires and cables and optical fiber cables shall be listed as having a maximum peak optical

density of 0.50 or less, an average optical density of 0.15 or less, and a maximum flame spread distance of 1.5 m (5 ft)or less when tested in accordance with NFPA 262, Standard Method of Test for Flame Travel and Smoke of Wires andCables for Use in Air-Handling Spaces, or shall be installed in metal raceways, metal sheathed cable, or totally enclosednonventilated busway.

4.3.11.5.5.2 Pneumatic tubing for control systems shall be listed as having a maximum peak optical density of 0.5 orless, an average optical density of 0.15 or less, and a maximum flame spread distance of 1.5 m (5 ft) or less whentested in accordance with ANSI/UL 1820, Standard for Safety Fire Test of Pneumatic Tubing for Flame and SmokeCharacteristics.

4.3.11.5.5.3 Nonmetallic fire sprinkler piping shall be listed as having a maximum peak optical density of 0.5 or less,an average optical density of 0.15 or less, and a maximum flame spread distance of 1.5 m (5 ft) or less when tested inaccordance with ANSI/UL 1887, Standard for Safety Fire Test of Plastic Sprinkler Pipe for Visible Flame and SmokeCharacteristics.

4.3.11.5.5.4 Optical fiber and communication raceways shall be listed as having a maximum peak optical density of0.5 or less, an average optical density of 0.15 or less, and a maximum flame spread distance of 1.5 m (5 ft) or less whentested in accordance with ANSI/UL 2024, Standard for Safety Optical-Fiber and Communication Cable Raceway.Cables installed within these raceways shall be listed as plenum cable in accordance with the requirements in4.3.11.5.5.1.

4.3.11.5.5.5 Raised floors, intermachine cables, electrical wires, listed plenum communication and optical-fiberraceways, and optical-fiber cables in computer/data processing rooms where these rooms are designed and installed inaccordance with NFPA 75, Standard for the Protection of Information Technology Equipment, shall be permitted.

4.3.11.5.5.6 Loudspeakers, recessed lighting fixtures, and other electrical equipment with combustible enclosures,including their assemblies and accessories, cable ties, and other discrete products, shall be permitted in the raised floorplenum where listed as having a maximum peak optical density of 0.5 or less, an average optical density of 0.15 or less,and a peak heat release rate of 100 kW or less when tested in accordance with UL 2043, Standard for Safety Fire Testfor Heat and Visible Smoke Release for Discrete Products and Their Accessories Installed in Air-Handling Spaces.

4.3.11.5.5.7 Air ducts complying with 4.3.1.2 and air connectors complying with 4.3.2 shall be permitted.4.3.11.5.5.8 Materials that, in the form in which they are used, have a potential heat value not exceeding 3500 Btu/lb

(8141 kJ/kg), where tested in accordance with NFPA 259, Standard Test Method for Potential Heat of BuildingMaterials, and include either of the following:

(1) Materials having a structural base of noncombustible material, with a surfacing not exceeding a thickness of in.(3.2 mm) that has a flame spread index not greater than 50

(2) Materials, in the form and thickness used, having neither a flame spread index greater than 25 nor evidence ofcontinued progressive combustion, and of such composition that surfaces that would be exposed by cutting through thematerial on any plane would have neither a flame spread index greater than 25 nor evidence of continued progressivecombustion, when tested in accordance with ASTM E 84, Standard Test Method of Surface Burning Characteristics ofBuilding Materials, or ANSI/UL 723, Standard Test Method for Surface Burning Characteristics of Building Materials.

4.3.11.5.6 4.3.11.5.5.9 Smoke detectors shall not be required to meet the requirements of 4.3.11.5.1.4.3.11.5.7 4.3.11.5.5.10 Supplementary materials for air distribution systems shall be permitted when complying with

4.3.3.4.3.11.5.8 4.3.11.5.6 The accessible portion of abandoned materials exposed to airflow shall be removed.

Supplementary materials and smoke detectors should be included in the list of items covered by4.3.11.5.5, just like they are in the section dealing with ceiling cavity plenums.

This code proposal just tries to get consistent language between the two sections providing charging language forplenum content materials. No requirements are being changed.




Revise 4.3.11.2.6.1 as shown:Electrical wires and cables and optical fiber cables shall be listed as having a maximum peak optical

density of 0.50 or less, an average optical density of 0.15 or less, and a maximum flame spread distance of 1.5 m (5 ft)or less when tested in accordance with NFPA 262,

, or shall be installed in metal raceways without an overall nonmetallic covering,metal sheathed cable without an overall nonmetallic covering, or totally enclosed non-ventilated metallic busway withoutan overall nonmetallic covering,.

Metal raceways can have a combustible nonmetallic jacket and therefore would not be suitable for anapplication exposed to the airflow. Likewise for metal sheathed cables.

_______________________________________________________________________________________________90A- Log #14


Revise text to read as follows:4.3.11.2.6.1* Electrical wires and cables and optical fiber cables shall be listed as having a maximum peak optical


, or shall be installed in metal raceways, metal sheathed cable, or totally enclosednon-ventilated busway or Reinforced Thermosetting Resin Conduit (RTRC) listed as having a maximum peak opticaldensity of 0.50 or less, an average optical density of 0.15 or less, and a maximum flame spread distance of 1.5 m (5 ft)or less when tested in accordance with NFPA 262,

Paragraph 4.3.11.2.6.1 of NFPA 90A currently permits electrical wires and cables and optical fibercables to be installed in metal raceways, metal sheathed cable or totally enclosed, non-ventilated busway. As analternative to this, the wires and cables are not required to be installed using one of these methods if they themselvescomply with the required optical smoke density and flame propagation requirements specified in NFPA 90A whenevaluated in accordance with the Standard Method of Test for Flame Travel and Smoke of Wires and Cables for Use inAir-Handling Spaces, NFPA 262. However, the use of any type of nonmetallic raceway is not currently permitted.





_______________________________________________________________________________________________Reinhard Hanselka, aidi, Inc.

Revise text and New text to read as follows:4.3.11.2.6.3-- Non Metallic fire sprinkler and other non metallic water containing piping shall be listed as having a

maximum peak optical density of 0.5 or less, an average optical density of 0.15 or less and a maximum flame spreaddistance of 1.5 m (5.0 ft) or less when tested in accordance with ANSI/UL 1887, Standard for Safety Fire Test of PlasticSprinkler Pipe for Visible Flame and Smoke Characteristics.

This change is needed to accommodate laboratories, factories and other occupancies that utilize HighPurity Piping Materials for the transport of Pressurized Pure Water. The standard of care should be equal or greaterthan Fire Sprinkler Pipe. To subject this type of piping to the same standard as dry pipe is technically incorrect andposes an unrealistic hardship on users.

_______________________________________________________________________________________________90A- Log #22


Revise text to read as follows:4.3.11.2.6.4 Optical fiber and communication raceways Raceways shall be listed as having a maximum peak optical

density of 0.5 or less, an average optical density of 0.15 or less, and a maximum flame spread distance of 1.5 m (5 ft) orless when tested in accordance with ANSI/UL 2024, Standard for Safety Optical-Fiber and Communications CableRaceway.


_______________________________________________________________________________________________90A- Log #45


Revise text to read as follows:4.3.11.2.6.5* Loudspeakers, recessed lighting fixtures, and other electrical equipment with combustible enclosures,

including their assemblies and accessories, cable ties, and other discrete products shall be permitted in the ceilingcavity plenum where listed as having a maximum peak optical density of 0.5 or less, an average optical density of 0.15or less, and a peak heat release rate of 100 kW or less when tested in accordance with ANSI/UL 2043, Standard forSafety Fire Test for Heat and Visible Smoke Release for Discrete Products and Their Accessories Installed inAir-Handling Spaces..

Add ANSI approval designation to UL 2043.



_______________________________________________________________________________________________Terry Peters, The Society of the Plastics Industry

New and Revised text to read as follows:Renumber 4.3.11.2.6.5 to 4.3.11.2.6.6, 4.3.11.2.6.6 to 4.3.11.2.6.7, 4.3.11.2.6.7 to 4.3.11.2.6.8 and 4.3.11.2.6.9 to

4.3.11.2.6.10 and insert a new 4.3.11.2.6.5:Cable routing assemblies shall be listed as having a maximum peak optical density of 0.50 or less,

an average optical density of 0.15 or less, and a maximum flame spread distance of 1.5 m (5 ft) or less when tested inaccordance with UL 2024a .

Cable routing assemblies are used for supporting and protecting large quantities of optical fiber, dataand communications cables in telecommunications and information technology applications.

NFPA 76-2009, has applications for cable routingassemblies in raised floor and ceiling cavity plenums in section 8.8.2.8.3.

Proposals for the use of cable routing assemblies are currently being processed for multiple articles in the NationalElectrical Code. I submitted the proposals for the NEC and did not include plenum applications because cable routingassemblies are not currently recognized in NFPA 90A. The purpose of this proposal is to provide for the listing ofplenum grade cable routing assemblies in NFPA 90A. If NFPA 90A accepts our proposals for cable routing assemblies,we will propose plenum grade routing assemblies for the next edition of the NEC.

For further information on cable routing assemblies seehttp://www.storage-expo.com/ExhibitorLibrary/302/FiberRunner_6.pdf.

_______________________________________________________________________________________________90A- Log #11


New text to read as follows:4.3.11.2.6.7-- Non Metallic Process and High Purity Water Piping shall be listed as having a maximum peak optical

density of 0.5 or less, an average optical density of 0.15 or less and a maximum flame spread distance of 1.5 m (5.0 ft)or less when tested in accordance with ANSI/UL 1887, Standard for Safety Fire Test of Plastic Sprinkler Pipe for VisibleFlame and Smoke Characteristics.


_______________________________________________________________________________________________90A- Log #23








For apparatus plenums less than 2000 cfm, Eelectrical wires and cables or optical fiber cables, or opticalfiber and communications raceways shall comply with 4.3.4, otherwise shall comply with 4.3.11.3.4 and 4.3.11.3.5.

Materials used in the construction of an apparatus plenum shall be noncombustible or shall be limitedcombustible having a maximum smoke developed index of 50 and shall be suitable for continuous exposure to thetemperature and humidity conditions of the environmental air in the plenum.

Electrical wires and cables and optical fiber cables shall be listed as having a maximum peak opticaldensity of 0.50 or less, an average optical density of 0.15 or less, and a maximum flame spread distance of 1.5 m (5 ft)or less when tested in accordance with NFPA 262,

, or shall be installed in metal raceways, metal sheathed cable, or totally enclosednonventilated busway.

The current restriction of 1.22 m (4 ft) cannot be adhered for apparatus plenums on medium to largeair handlers (approximately greater than 2000 cfm), specifically for low voltage HVAC control devices. For very largeapparatus plenums (greater than 15,000 cfm), the conductor lengths may approach 15-20 ft. These lengths ofconductors are routinely required for control and power wiring of control devices (internal damper actuators, sensors, fanmotors) due to the distance from the device to the exterior of the plenum. Freeze protection thermostats by the currentdefinition also cannot meet this standard since these devices are at least 12 feet in length. Therefore, it is proposed thesame standards listed for the air handler unit room plenums (4.3.11.4.5 and 4.3.11.4.6) be replicated for apparatusplenums with air flows capacity greater than 2000 cfm.

_______________________________________________________________________________________________90A- Log #24




The main reason for requiring removal of abandoned materials is for safety of personnel in terms of the potential forabandoned material to fall and/or entangle workers, electrical personnel and firefighters. Note that section 4.3.11.5.8states as follows:

“4.3.11.5.8 The accessible portion of abandoned materials exposed to airflow shall be removed.”




Revise text to read as follows:4.3.11.4.6* Electrical wires and cables and optical fiber cables shall be listed as having a maximum peak optical


, or shall be installed in metal raceways, metal sheathed cable, or totally enclosednonventilated busway or Reinforced Thermosetting Resin Conduit (RTRC) listed as having a maximum peak opticaldensity of 0.50 or less, an average optical density of 0.15 or less, and a maximum flame spread distance of 1.5 m (5 ft)or less when tested in accordance with NFPA 262,

Paragraph 4.3.11.4.6 of NFPA 90A currently permits electrical wires and cables and optical fibercables to be installed in metal raceways, metal sheathed cable or totally enclosed, nonventilated busway. As analternative to this, the wires and cables are not required to be installed using one of these methods if they themselvescomply with the required optical smoke density and flame propagation requirements specified in NFPA 90A whenevaluated in accordance with the Standard Method of Test for Flame Travel and Smoke of Wires and Cables for Use inAir-Handling Spaces, NFPA 262. However, the use of any type of nonmetallic raceway is not currently permitted.



_______________________________________________________________________________________________90A- Log #35


New text to read as follows:4.3.11.5.5 Materials within a raised floor plenum exposed to the airflow shall comply with 4.3.11.5.5.1 through

4.3.11.5.5.9 4.3.11.5.5.8, as applicable.4.3.11.5.5.7 Plastic plumbing piping and tubing within a raised floor plenum shall exhibit a maximum peak optical

density of 0.5 or less, an average optical density of 0.15 or less, and a maximum flame spread distance of 1.5 m (5 ft) orless when tested in accordance with ANSI/UL 1887, Standard for Safety Fire Test of Plastic Sprinkler Pipe for VisibleFlame and Smoke Characteristics.

Pipes are installed in ceiling cavity plenums and raised floor plenums today and they comply with theletter of the standard but not with the spirit. They are installed after being tested by means of ASTM E 84, but ASTM E84 does not have a procedure for testing pipes. Consequently the test is being conducted by placing a single pipe in thetunnel, with the ends sealed and full of water. That does not ensure safe materials in plenums. During installation and/ormaintenance or when repairs are being done, or in the event of an incipient fire, any water potentially present in thepipes would drain out and a highly combustible material would cause flame spread in the plenum.

UL 1887 requires testing of pipes without water. The requirements recommended for plastic pipes is the same as thatrequired for sprinkler pipes.

The scope of UL 1887 is limited to sprinkler pipes but it can easily be expanded since the geometry of pipes and ofsprinkler pipes is clearly similar.




Revise text to read as follows:4.3.11.5.5.1* Electrical wires and cables and optical fiber cables shall be listed as having a maximum peak optical


, or shall be installed in metal raceways, metal sheathed cable, or totally enclosednonventilated busway or Reinforced Thermosetting Resin Conduit (RTRC) listed as having a maximum peak opticaldensity of 0.50 or less, an average optical density of 0.15 or less, and a maximum flame spread distance of 1.5 m (5 ft)or less when tested in accordance with NFPA 262,

Paragraph 4.3.11.5.5.1 of NFPA 90A currently permits electrical wires and cables and optical fibercables to be installed in metal raceways, metal sheathed cable or totally enclosed, nonventilated busway. As analternative to this, the wires and cables are not required to be installed using one of these methods if they themselvescomply with the required optical smoke density and flame propagation requirements specified in NFPA 90A whenevaluated in accordance with the Standard Method of Test for Flame Travel and Smoke of Wires and Cables for Use inAir-Handling Spaces, NFPA 262. However, the use of any type of nonmetallic raceway is not currently permitted.



_______________________________________________________________________________________________90A- Log #4

_______________________________________________________________________________________________Terry Peters, The Society of the Plastics Industry

New and Revised text to read as follows:Renumber 4.3.11.5.5.2 to 4.3.11.5.5.3, 4.3.11.5.5.3 to 4.3.11.5.5.4, 4.3.11.5.5.4 to 4.3.11.5.5.5, 4.3.11.2.5.5 to

4.3.11.5.5.6, 4.3.11.5.5.6 to 4.3.11.5.5.7, 4.3.11.5.5.7 to 4.3.11.5.5.8 and insert a new 4.3.11.5.5.2:Cable routing assemblies shall be listed as having a maximum peak optical density of 0.50 or less,

an average optical density of 0.15 or less, and a maximum flame spread distance of 1.5 m (5 ft) or less when tested inaccordance with UL 2024a .

Cable routing assemblies are used for supporting and protecting large quantities of optical fiber, dataand communications cables in telecommunications and information technology applications.

NFPA 76-2009, Standard for the Fire Protection of Telecommunications Facilities, has applications for cable routingassemblies in raised floor and ceiling cavity plenums in section 8.8.2.8.3.

Proposals for the use of cable routing assemblies are currently being processed for multiple articles in the NationalElectrical Code. I submitted the proposals for the NEC and did not include plenum applications because cable routingassemblies are not currently recognized in NFPA 90A. The purpose of this proposal is to provide for the listing ofplenum grade cable routing assemblies in NFPA 90A. If NFPA 90A accepts our proposals for cable routing assemblies,we will propose plenum grade routing assemblies for the next edition of the NEC.

For further information on cable routing assemblies seehttp://www.storage-expo.com/ExhibitorLibrary/302/FiberRunner_6.pdf.




New text to read as follows:4.3.11.5.5.3--Non Metallic fire sprinkler and other non metallic water containing piping shall be listed as having a

maximum peak optical density of 0.5 or less, an average optical density of 0.15 or less and a maximum flame spreaddistance of 1.5 m (5.0 ft) or less when tested in accordance with ANSI/UL 1887, Standard for Safety Fire Test of PlasticSprinkler Pipe for Visible Flame and Smoke Characteristics.


_______________________________________________________________________________________________90A- Log #5


Revise 4.3.11.5.5.4 as shown:Optical fiber and communication raceways shall be listed as having a maximum peak optical density of

0.5 or less, an average optical density of 0.15 or less, and a maximum flame spread distance of 1.5 m (5 ft) or less whentested in accordance with ANSI/UL 2024, .Cables installed within these raceways shall be listed as plenum cable in accordance with the requirements in4.3.11.5.5.1.

Cables installed within a raceway are outside the scope on NFPA 90A. See Annex notes A.4.3.4.4 andA.4.3.11.4.6.The text recommended for deletion duplicates a requirement in the National Electrical Code.

Electrical wires and cables and optical fiber cables installed in metal raceways or metal sheathed cable arenot considered to be exposed to the airflow, and need not meet the requirements of 4.3.4.4. Electrical wires and cablesand optical fiber cables listed to UL Subject 2424, , areconsidered to be suitable for use wherever cables tested in accordance with NFPA 262,

, are required.Electrical wires and cables and optical fiber cables installed in metal raceways, metal sheathed cable, or

totally enclosed nonventilated busway are not considered to be exposed to the airflow, and need not meet therequirements of 4.3.11.4.6. Electrical wires and cables and optical fiber cables listed to UL Subject 2424,

, are considered to be suitable for use wherever cables tested inaccordance with NFPA 262,

, are required.




Revise text to read as follows:4.3.11.5.5.4 Optical fiber and communication raceways Raceways shall be listed as having a maximum peak optical

density of 0.5 or less, an average optical density of 0.15 or less, and a maximum flame spread distance of 1.5 m (5 ft) orless when tested in accordance with ANSI/UL 2024, Standard for Safety Optical-Fiber and Communication CableRaceway. Cables installed within these raceways shall be listed as plenum cable in accordance with the requirements in4.3.11.5.5.1.


_______________________________________________________________________________________________90A- Log #26




_______________________________________________________________________________________________90A- Log #46


Revise text to read as follows:4.3.11.5.5.6 Loudspeakers, recessed lighting fixtures, and other electrical equipment with combustible enclosures,

including their assemblies and accessories, cable ties, and other discrete products, shall be permitted in the raised floorplenum where listed as having a maximum peak optical density of 0.5 or less, an average optical density of 0.15 or less,and a peak heat release rate of 100 kW or less when tested in accordance with ANSI/UL 2043, Standard for Safety FireTest for Heat and Visible Smoke Release for Discrete Products and Their Accessories Installed in Air-Handling Spaces.





New text to read as follows:4.3.11.5.5.9-- Non Metallic Process and High Purity Water Piping shall be listed as having a maximum peak optical

density of 0.5 or less, an average optical density of 0.15 or less and a maximum flame spread distance of 1.5 m (5.0 ft)or less when tested in accordance with ANSI/UL 1887, Standard for Safety Fire Test of Plastic Sprinkler Pipe for VisibleFlame and Smoke Characteristics.


_______________________________________________________________________________________________90A- Log #27




The main reason for requiring removal of abandoned materials is for safety of personnel in terms of the potential forabandoned material to fall and/or entangle workers, electrical personnel and firefighters. This change is made forconsistency with the NEC and with proposals on other sections of NFPA 90A.

_______________________________________________________________________________________________90A- Log #62


Revise 4.3.12.1.1 as follows:Where another code prohibits Eegress corridors in health care, detention and correctional, and residential

occupancies shall not be used as a portion of a supply, return, or exhaust air system serving adjoining areas, therequirements of unless otherwise permitted by 4.3.12.1.2.1 through 4.3.12.1.2.4 shall apply.

NFPA 90A should not be specifying occupancy requirements even if they provide better safeguards asthis should fall under the Building or Life Safety Code. NFPA 101 already prohibits transfer grills, louvers, transoms, etc.from being installed in corridors and doors of health care occupancies, lodging and rooming houses, hotel anddormitories, apartments and residential board and care occupancies.

Note: it is not my intent to weaken existing requirements and permit egress corridors to be used as a portion of asupply, return or exhaust air system in these occupancies. If this proposal inadvertently does this, then it should berejected. The purpose of this proposal is to keep NFPA 90A from establishing occupancy-specific requirements, andleave those requirements to the Life Safety and Building Codes. In order to facilitate this, the TC could draft suchproposals to the respective occupancy chapters to ensure the intent of 4.3.12.1.1 is maintained.




New text to read as follows:Add new 5.1.3.3, 5.1.3.3.1 and A.5.1.3.3.1 as follows:

Air-handling equipment rooms, including the protection of openings, shall be separated from shafts byconstruction having a fire resistance rating not less than that required for the shaft by 5.3.4.

Fire-resistant separation shall not be required for air handling equipment rooms that are enclosed byconstruction having a fire resistance rating not less than that required for the shaft.

Combustible storage is not permitted unless the room is separated from adjacent spaces by constructionhaving a fire resistance rating of not less than one hour.

Rooms containing storage that is specifically required for air handling equipment located in the room arenot required to have a fire resistance rating of one hour.

Air filters is an example of permissible storage.To prevent air handling rooms located adjacent to shafts from being used for general purpose storage.

Though this could be considered a fire code issue, by placing this provision in this standard, it better ensures that airhandling rooms located adjacent to shafts won’t be used for such purposes and additionally potentially protects theintegrity of the air handling equipment within the room from a fire that originates from general purpose storage. Note:building codes don’t generally require air handling rooms to be separated from adjacent spaces by fire ratedconstruction; as such, a fire in these rooms (which becomes more likely if combustible storage is present) could spreadunprotected. The annex note provides an example of the type of storage which would be permitted as operationally, itmakes sense to permit the storage of replacement air filters in these rooms.

_______________________________________________________________________________________________90A- Log #43


Education Facilities ExecutivesAdd the following text to the front end of Chapter 6, Controls

6.1 Wiring. The installation of electrical wiring and equipment associated with the operation and control ofair-conditioning and ventilating systems shall be in accordance with ,

This proposal conveys some of the leading safety practices asserted in NFPA 79 - Electrical Standardfor Industrial Machinery, into the next version NFPA 90A. Electrical safety in field built HVAC control systems forbuildings has not yet had a broad discussion compared the manufacturing process control systems.

Two photographs--attached herewith in Microsoft Publisher--are submitted for the committee’s review. The need forpartitioning of 480 VAC circuits, which are capable of producing substantial flash energy, from lower voltage should beself-evident. The absence of language that reduces this risk causes facility professionals in the education facilitiesindustry--and probably in other industries--to give electrical flash hazard training to HVAC control mechanics and/or pairup HVAC control mechanics with electricians who have had electrical flash training. There is nothing inherently wrongwith an HVAC control mechanics receiving such training but costs and risk are reduced when thesafety-versus-economy conundrum is worked from both ends: BUILD SAFER EQUIPMENT as well as offer training.

This proposal strengthens the linkage of NFPA 90A with other documents in the NFPA safety document universe.




New text to read as follows:Add an annex note to 6.3.1 as follows:

Smoke dampers shall be controlled by an automatic alarm-initiated device.ypically, duct smoke detectors are used to initiate the signal to control a smoke damper.

As currently written, any automatic alarm initiating device is permitted to control smoke dampers (e.g.,manual pull station, area smoke or heat detector, duct smoke detector, sprinkler system, etc.). The new annex is merelymeant to inform the reader duct detectors are typically used to control smoke dampers (and might actually be thepreferred method).

_______________________________________________________________________________________________90A- Log #68

_______________________________________________________________________________________________Randy Willard, National Reconnaissance Office

Add new text to read follows:6.4.2.4 Smoke detectors shall not be required for fans units or air distribution systems that serve a single open area.

Appendix section A.6.4 identifies the intent of providing smoke detectors and related controls in anHVAC system is to prevent the distribution of smoke. Fan units or air distribution systems that only serve a single openarea are by definition incapable of distributing smoke to other parts of a building. An example of such a system is arooftop HVAC unit in a warehouse or big-box retail store. This proposal would clarify that return smoke detectors arenot required in such areas. This proposal would also provide consistency with the International Mechanical Code whichalready has this exception.

_______________________________________________________________________________________________90A- Log #64


Revise 6.4.3 as follows:

Smoke detectors provided as required by 6.4.2 shall automatically stop their respective fan(s) on detecting thepresence of smoke.

Smoke detectors provided as required by 6.4.2 shall automatically close their respective smoke damper ondetecting the presence of smoke

Where the return air fan is functioning as part of an engineered smoke-control system and a different mode isrequired, the smoke detectors shall not be required to automatically stop their respective fans or close their respectivedampers.

Duct smoke detectors should also be required to close smoke dampers that are required by NFPA 90Aor another code, that are not part of an engineered smoke control system, to prevent the spread of smoke.




Revise 6.4.4.4 as follows:Smoke detectors powered separately from the fire alarm system for the sole function of stopping fans or

closing smoke dampers shall not require standby power.This proposal simply extends the existing exception to include similar detectors arranged to close

smoke dampers.





6.4.4.4 Smoke detectors powered separately from the fire alarm system for the sole function of stopping fans shall notrequire emergency or standby power.

This change will clarify that smoke detectors may require neither standby nor emergency power. Anemergency power system is distinct from a legally required standby power system or an optional standby systemaccording to the National Electric Code and NFPA 110. Appearance of the word "standby" is not specific enough anddoes not include the possibility that in some applications, particularly in facilities that deploy performance-based smokecontrol methods, fans may or may not be required to be supplied from an emergency power system.

On design documents, and as built in the field in many facility types, the backup power systems of NEC Articles 700,701 and 702 are often installed together but do not share the same distribution switchgear and conduit. The followingextracts from each article are provided for the convenience of the committee in making its decision on this proposal:

I. General700.1 Scope. The provision of this article apply to the electrical safety of the installation, operation, and maintenance of

emergency systems consisting of circuits and equipment intended to supply, distribute, and control electricity forillumination, power, or both, to required facilities when the normal electrical supply or system is interrupted.

Emergency systems are those systems legally required and classed as emergency by municipal, state, federal, orother codes, or by any governmental agency having jurisdiction. These systems are intended to automatically supplyillumination, power, or both, to designated areas and equipment in the event of failure of the normal supply or in theevent of accident to elements of a system intended to supply, distribute, and control power and illumination essential forsafety to human life.

FPN No. 1: For further information regarding wiring and installation of emergency systems in health care facilities, seeArticle 517.

FPN No. 2: For further information regarding performance and maintenance of emergency systems in health carefacilities, see NFPA 99-2005, Standard for Health Care Facilities.

FPN No. 3: Emergency systems are generally installed in places of assembly where artificial illumination is required forsafe exiting and for panic control in buildings subject to occupancy by large numbers of persons, such as hotels,theaters, sports arenas, health care facilities, and similar institutions. Emergency systems may also provide power forsuch functions as ventilation where essential to maintain life, fire detection and alarm systems, elevators, fire pumps,public safety communications systems, industrial processes where current interruption would produce serious life safetyor health hazards, and similar functions.

FPN No. 4: For specification of locations where emergency lighting is considered essential to life safety, see NFPA101®-2006, Life Safety Code®.

FPN No. 5: For further information regarding performance of emergency and standby power systems, see NFPA110.2005, Standard for Emergency and Standby Power Systems.

Article 701 Legally Required Standby SystemsI. General701.1 Scope. The provisions of this article apply to the electrical safety of the installation, operation, and maintenance

of legally required standby systems consisting of circuits and equipment intended to supply, distribute, and controlelectricity to required facilities for illumination or power, or both, when the normal electrical supply or system isinterrupted. The systems covered by this article consist only of those that are permanently installed in their entirety,including the power source.

FPN No. 1: For additional information, see NFPA 99-2005, Standard for Health Care Facilities.FPN No. 2: For further information regarding performance of emergency and standby power systems, see NFPA

110-2005, Standard for Emergency and Standby Power Systems.FPN No. 3: For further information, see ANSI/IEEE 446-1995, Recommended Practice for Emergency and Standby

Power Systems for Industrial and Commercial Applications.701.2 Definition.Legally Required Standby Systems. Those systems required and so classed as legally required standby by municipal,

state, federal, or other codes or by any governmental agency having jurisdiction. These systems are intended toautomatically supply power to selected loads (other than those classed as emergency systems) in the event of failure of


Report on Proposals – June 2011 NFPA 90Athe normal source.

FPN: Legally required standby systems are typically installed to serve loads, such as heating and refrigerationsystems, communications systems, ventilation and smoke removal systems, sewage disposal, lighting systems, andindustrial processes, that, when stopped during any interruption of the normal electrical supply, could create hazards orhamper rescue or fire-fighting operations.

Article 702 Optional Standby SystemsI. General702.1 Scope. The provisions of this article apply to the installation and operation of optional standby systems. The

systems covered by this article consist of those that are permanently installed in their entirety, including prime movers,and those that are arranged for a connection to a premises wiring system from a portable alternate power supply.

702.2 Definition.Optional Standby Systems. Those systems intended to supply power to public or private facilities or property where life

safety does not depend on the performance of the system. Optional standby systems are intended to supply on-sitegenerated power to selected loads either automatically or manually.

FPN: Optional standby systems are typically installed to provide an alternate source of electric power for such facilitiesas industrial and commercial buildings, farms, and residences, and to serve loads such as heating and refrigerationsystems, data processing and communications systems , and industrial processes that, when stopped during any poweroutage, could cause discomfort, serious interruption of the process, damage to the product or process, or the like.

It is hoped that as facilities with complex smoke control systems are renovated, this proposal will limit inadvertentcrossing over of the three types of backup power systems described in these extracts from NEC Articles 700, 701 and702.

_______________________________________________________________________________________________90A- Log #66


Revise 7.2 as follows and add new annex A.7.2:All fire dampers, smoke dampers, and ceiling dampers

shall be operated prior to the occupancy of a building to determine that they function in accordance with therequirements of this standard.

During acceptance testing, all dampers should be checked to verify they completely close. See NFPA 105 foradditional testing requirements for smoke dampers and combination fire/smoke dampers. See NFPA 80 for additionaltesting requirements for fire dampers including a requirement to test the damper one year after installation.

New annex note attempts to coordinate installation and testing requirements among all the applicablestandards.

_______________________________________________________________________________________________90A- Log #59


Revise A.4.2.1.2 as follows:The location of outside air intakes, including intakes located on roofs, needs to be carefully selected and

located to avoid drawing in objectionable materials including, but not limited to, combustible materials and toxic orhazardous vapors. The location should consider proximity to emergency smoke exhaust, garage exhaust, discharge ofkitchen hood vents, and other objectionable discharges from the building or adjacent structures.

Clarifying that it is also worth noting the location of outside intakes when HVAC units draw air from ontop of roofs.




Revise text to read as follows:A.4.3.11.2.6.5 Cable ties listed to ANSI/UL 1565, Positioning Devices, and marked for use in plenums are considered

suitable for use whenever cable ties tested in accordance with ANSI/UL 2043, Standard for Fire Test for Heating VisibleSmoke Release for Discrete Products and Their Accessories Installed in Air Handling Spaces, are required.


_______________________________________________________________________________________________90A- Log #1

_______________________________________________________________________________________________Michael J. Jontry, Illinois Department of Public Health

Delete entire current text. Insert new text: This section applies only to those occupancies namedand is to be applied to the design of HVAC system air movement. The intent is that air movement into or out of thespecified rooms shall be solely by conditions not within the control of the designer, such as wind loading, and shall notbe designed into the systems serving these occupancies.

The current text does not specifically address the named occupancies and does not address the actualissue. In the 1975 Edition of NFPA 90A it reads, in part: "...the smoke carried by relatively cool air precedes hot air thatcan actuate heat responsive devices, yet the cooler smoke can be distributed in sufficient quantity to cause injury ordeath, damage to property, or a tendency toward panic...". This is particularly true for the three occupancies specificallycalled out in 4.3.12.1.1, all of which are Defend in Place occupancies in which the occupants cannot escapeapproaching smoke by virtue of imposed or physical conditions. The proposed wording is specific to the need andavoids inclusion of unnecessary irrelevant language.

_______________________________________________________________________________________________90A- Log #55


Revise Annex B.2 as follows

Refer to NFPA 80, for inspection and maintenance offire dampers, ceiling dampers and combination fire/smoke dampers. Each damper should be examined every 2 years toensure that it is not rusted or blocked, giving attention to hinges and other moving parts. It is recommended thatdampers operate with normal system airflow to ensure that they close and are not held open by the airstream. Careshould be exercised to ensure that such tests are performed safely and do not cause system damage.

Refer to NFPA 105, for inspection andmaintenance of smoke dampers and combination fire/smoke dampers.

Refer to NFPA 92A, , formaintenance of smoke and combination fire/smoke dampers for each damper installed as part of a smoke controlsystem.

NFPA 80 is now responsible for inspection, testing and maintenance of fire and ceiling dampers;NFPA 105 is now responsible for inspection, testing and maintenance of smoke dampers; and both NFPA 80 and NFPA105 address inspection, testing and maintenance of combination fire/smoke dampers. As such, any discussion ofinspection, testing and maintenance of fire damper, smoke dampers, or combination fire/smoke dampers should bereferred to the respective standard.




Revise text to read as follows:C.1.2.1 ASHRAE Publications. American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc., 1791

Tullie Circle, NE, Atlanta, GA 30329-2305.ASHRAE Handbook — Fundamentals, 2009 2001.C.1.2.3 NAIMA Publications. North American Insulation Manufacturers Association, 44 Canal Center Plaza, Suite

310, Alexandria, VA 22314.Fibrous Glass Duct Construction Manual, 4th edition, 2000.Fibrous Glass Duct Liner Standard, 3rd Edition 2002 1994.Fibrous Glass Duct Construction Standards, 5th Edition, 2002Residential Fibrous Glass Duct Construction Standards, 3rd Edition, 2002.C.1.2.4 SMACNA Publications. Sheet Metal and Air-Conditioning Contractors' National Assn., Inc., 4201 Lafayette

Center Drive, Chantilly, VA 22021-1209Fire, Smoke and Radiation Damper Installation Guide for HVAC Systems, 2002.C.1.2.5 UL Publications. Underwriters Laboratories Inc., 333 Pfingsten Road, Northbrook, IL 60062.ANSI/UL 555, Standard for Safety Fire Dampers, 2006.ANSI/UL 555S, Standard for Safety Smoke Dampers, 1999 2006.ANSI/UL 1565, Positioning Devices, 2002.Building Materials Directory, 2009 2006.Fire Resistance Directory, 2009 2006 ,Heating, Cooling, Ventilating and Cooking Equipment and Food Safety Equipment Directory, 2009 2006.ANSI/UL 2043, Standard for Safety Fire Test for Heat and Visible Smoke Release for Discrete Products and Their

Accessories Installed in Air-Handling Spaces, 2008 1996.

Standards updateNote that the

_______________________________________________________________________________________________90A- Log #48


Revise text to read as follows:C.1.2.5 UL Publications. Underwriters Laboratories Inc., 333 Pfingsten Road, Northbrook, IL 60062.ANSI/UL 555, Standard for Safety Fire Dampers, 2006, Revised 2009.ANSI/UL 555S, Standard for Safety Smoke Dampers, 2006 1999, Revised 2009.ANSI/UL 1565, Positioning Devices, 2002, Revised 2008.Building Materials Directory, 2006 2009.Fire Resistance Directory, 2006 2009.Heating, Cooling, Ventilating and Cooking Equipment Directory, 2006 2009.ANSI/UL 2043, Standard for Fire Test for Heat and Visible Smoke Release for Discrete Products and Their

Accessories Installed in Air Handling Spaces, 1996 2008.UL Subject 2424, Outline of Investigation for Cable Marked Limited Combustible, 2006.

Update referenced standards to most recent revisions. Add ANSI approval designation whereappropriate.


Report on Proposals – June 2011 NFPA 90B_______________________________________________________________________________________________90B- Log #CP5


Review entire document to: 1) Update any extracted material by preparing separate proposals to doso, and 2) review and update references to other organizations documents, by preparing proposal(s) as required.

To conform to the NFPA Regulations Governing Committee Projects.

_______________________________________________________________________________________________90B- Log #1

_______________________________________________________________________________________________Duane and Keith Johnson, Pensacola, FL

It is proposed that a fan-disabling device be installed in the thermostats of warm air heating and airconditioning systems that would function as described in United States Patent No. US 7,481,261 B2 titled FANDISABLING DEVICE. This is a control system for disabling the fan of a heating, ventilating, and air-conditioning systemupon the detection of an audible alarm, such as a smoke alarm. The system utilizes a tunable band pass filter/decibellevel detector in conjunction with a microphone to detect an audible alarm. When an alarm is detected, the fan isdisabled whether the HVAC is operating in the heating, cooling, or manual mode.

Normally, when a fire occurs, a smoke detecting system sounds an audible alarm. Depending upon theparticular structure, whether it is a stand-alone residence, apartment building, work environment, etc., different actionsmay be taken. In general, persons in the area alert the local fire department and, rapidly as safely possible, exit thearea. Normally, in their haste to leave, the fan system is left in whatever state it happened to be. If the fire occurs in aresidence when no one is home and the air-conditioning system is on, the fire would increase the temperature and theAC system would turn on causing the smoke to be spread throughout the residence and the fire to be fed fresh air. Thiswould cause fire and smoke damages to the residence and it's contents.This suggested system would minimize the spread of smoke and gases throughout the area by automatically shutting

down the fan systems. This would slow the spread of smoke, allowing the occupants more time for a safer egress.Likewise, the fire would not be fed by re-circulating air and growth of the fire would be minimized. This system shouldresult in less fire and smoke damage to the building and it's contents.

_______________________________________________________________________________________________90B- Log #2

_______________________________________________________________________________________________Marcelo M. Hirschler, GBH International

Revise text as follows:

ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959.ASTM C 411, Standard Test Method for Hot-Surface Performance of High-Temperature Thermal Insulation, 1997

2005.ASTM D 93, Standard Test Methods for Flashpoint by Pensky-Martens Closed Cup Tester, 2006 2008.ASTM E 84, Standard Test Method for Surface Burning Characteristics of Building Materials, 2006a 2009c.ASTM E 136, Standard Test Method for Behavior of Materials in a Vertical Tube Furnace at 750°C, 2004 2009a.ASTM E 2231, Standard Practice for Specimen Preparation and Mounting of Pipe and Duct Insulation Materials to

Assess Surface Burning Characteristics, 2007 2009.Standards update.


Report on Proposals – June 2011 NFPA 90B_______________________________________________________________________________________________90B- Log #5


Revise text as follows:

Sheet Metal and Air Conditioning Contractors' National Association, 4201 Lafayette Center Drive, Chantilly, VA 2015122151-1209.Fibrous Glass Duct Construction Standards , 6th. 7th edition, 2003.HVAC Duct Construction Standards — Metal and Flexible, 2nd 3rd edition, 2005 .Residential Comfort System Installation Standards Manual, 7th edition, 1998.

Underwriters Laboratories Inc., 333 Pfingsten Road, Northbrook, IL 60062-2096.ANSI/UL 94, Standard for Safety Test for Flammability of Plastic Materials for Parts in Devices and Appliances, 2006.ANSI/UL 181, Standard for Safety Factory-Made Air Ducts and Air Connectors, 2005.ANSI/UL 181A, Standard for Safety Closure Systems for Use with Rigid Air Ducts, 2005.ANSI/UL 181B, Standard for Safety Closure Systems for Use with Flexible Air Ducts and Air Connectors, 2005.ANSI/UL 723, Standard Test Method for Surface Burning Characteristics of Building Materials, 2008 2003.ANSI/UL 900, Standard for Safety Air Filter Units, 2004.

Standards update.

_______________________________________________________________________________________________90B- Log #9


2.3.4 UL Publications.Underwriters Laboratories Inc., 333 Pfingsten Road, Northbrook, IL 60062-2096.ANSI/UL 94, Standard for Safety Test for Flammability of Plastic Materials for Parts in Devices and Appliances, 2006

1996, Revised 2009.ANSI/UL 181, Standard for Safety Factory-Made Air Ducts and Air Connectors, 2005, Revised 2008.ANSI/UL 181A, Standard for Safety Closure Systems for Use with Rigid Air Ducts, 2005, Revised 2008.ANSI/UL 181B, Standard for Safety Closure Systems for Use with Flexible Air Ducts and Air Connectors, 2005,

Revised 2008.ANSI/UL 723, Standard Test Method for Surface Burning Characteristics of Building Materials, 2003 2008.ANSI/UL 900, Standard for Air Filter Units, 2004, Revised 2009.

Update referenced standards to most recent revisions.

_______________________________________________________________________________________________90B- Log #CP1


Adopt the preferred definition from the NFPA Glossary of Terms as follows:. Having access to but which first may requires the removal of a panel, door, or similar covering of the

item described. [ , 2009]



Report on Proposals – June 2011 NFPA 90B_______________________________________________________________________________________________90B- Log #CP2


Adopt the preferred definition from the NFPA Glossary of Terms as follows:A material that, in the form in which it is used and under the conditions anticipated,

will not ignite, burn, support combustion, or release flammable vapors, when subjected to fire or heat. Materials that arereported as passing ASTM E 136 Standard Test Method for Behavior of Materials in a Vertical Tube Furnace at 750Degrees C, shall be are considered noncombustible materials. [ 2009]


_______________________________________________________________________________________________90B- Log #6


Revise text as follows:Vibration isolation connectors in duct systems shall be made of approved flame-retardant fabric or shall

consist of sleeve joints with packing of approved noncombustible material.The flame-retardant fabric shall not exceed 254 mm (10 in.) in length in the direction of airflow.

Vibration isolation connectors in duct systems shall comply with 4.1.1.1.3.1 or 4.1.1.1.3.2.The connector shall be made of approved fabric meeting the flame propagation performance criteria

contained in NFPA 701, Standard Methods of Fire Tests for Flame Propagation of Textiles and Films and shall notexceed 254 mm (10 in.) in length in the direction of airflow.

The connector shall consist of sleeve joints with packing of approved material, exhibiting either (a) amaximum flame spread index of 25 and a maximum smoke developed index of 450 when tested in accordance withASTM E 84, Standard Test Method for Surface Burning Characteristics of Building Materials or with ABSI/UL 723,Standard Test Method for Surface Burning Characteristics of Building Materials or (b) the criteria of Section 6.1.1.3.6(3)when tested in accordance with NFPA 286, Standard Methods of Fire Tests for Evaluating Contribution of Wall andCeiling Interior Finish to Room Fire Growth.

A “flame retardant fabric” is usually taken to mean a fabric that complies with the small-scale test fromNFPA 701, which has been eliminated from that standard for over 10 years. The term “flame retardant fabric” ismisleading and has been eliminated from most NFPA documents. Present versions of NFPA 701 contain two tests(depending on the weight, or a real density of the fabric) but both of them are very much less severe than ASTM E 84and neither one measures smoke. The requirement for materials to be noncombustible is excessive and a requirementto meet ASTM E 84 Class A (25/450) is more adequate. Throughout NFPA documents NFPA 286 is permitted to beused as an alternative to ASTM E 84.




Revise text as follows:Vibration isolation connectors in duct systems shall comply with one of the following:

(1) The fabric shall comply with the flame propagation performance criteria of NFPA 701, Standard Methods of FireTests for Flame Propagation of Textiles and Films, and it shall not exceed a length of 254 mm (10 in.) in the direction ofairflow.(2) The connectors shall consist of sleeve joints with packing of material that exhibits a flame spread index not

exceeding 25 when tested in accordance with ASTM E 84 or with ANSI/UL 723 in duct systems shall be made ofapproved flame-retardant fabric or shall consist of sleeve joints with packing of approved noncombustible material .

The flame-retardant fabric shall not exceed 254: mm (10 in.) in length in the direction of airflow.All materials in duct systems are required to comply with the requirements of 25 flame spread index

and 50 smoke developed index in accordance with ASTM E 84. Fabrics that are “flame retardant” are ones that simplymeet NFPA 701, which is a very much milder fire test and does not have smoke requirements. Additionally it has beenshown that it is much better, from the point of view of fire safety, to test the entire product rather than individualcomponents.

_______________________________________________________________________________________________90B- Log #3


Revise text as follows:Materials of construction of the enclosure shall be one of the following:

(1) Material that is wholly noncombustible(2) Material that exhibits a flame spread index not exceeding 25 when tested in accordance with ASTM E 84, or

ANSI/UL 723(3) Material that complies with the following when tested in accordance with NFPA 286:(a) Flames shall not spread to the ceiling during the 40 kW exposure.(b) During the 160 kW exposure, the following criteria shall be met:i. Flame shall not spread to the outer extremities of the sample on the 2440 mm × 3660 mm (8 ft × 12 ft) wall.ii. Flashover shall not occur.(c) The peak heat release rate throughout the test shall not exceed 800 kW.(a) During the 40 kW exposure, flames shall not spread to the ceiling.(b) The flame shall not spread to the outer extremity of the sample on any wall or ceiling.(c) Flashover, as defined in NFPA 286, shall not occur.(d) The peak heat release rate throughout the test shall not exceed 800 kW.(e) The total smoke released throughout the test shall not exceed 1,000 m2.

The revised language is consistent with the revised language proposed in NFPA 101 and 5000 (andaccepted by the NFPA FUR committee at ROP level). In fact, this is purely editorial and intended for simplification.Clearly the interior finish should fail the criteria if the material has flame spreading to the outer extremity of the sample(meaning all the way to the end of the room or ceiling) even before the burner is raised to 160 kW. Also, the materialshould fail the test is flashover occurs when the burner is still at 40 kW. The present language could be interpreted tomean that a material that burns completely within a minute and/or reaches flashover does not fail the test. That shouldnot be the case.




Revise text as follows:ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA

19428-2959.ASTM E 84, Standard Test Method for Surface Burning Characteristics of Building Materials, 2006a 2009c.ASTM E 2231, Standard Practice for Specimen Preparation and Mounting of Pipe and Duct Insulation Materials to

Assess Surface Burning Characteristics, 2002 2009.Standards update.

_______________________________________________________________________________________________90B- Log #4


Revise text as follows:North American Insulation Manufacturers Association, 44 Canal Center Plaza, Suite 310,

Alexandria, VA 22314.Fibrous Glass Duct Construction Standard, 4th edition, 2000.Fibrous Glass Duct Liner Standard, 3rd Edition 2002 1st Edition 1994.Fibrous Glass Duct Construction Standards, 5th Edition, 2002

Underwriters Laboratories Inc., 333 Pfingsten Road, Northbrook, IL 60062.ANSI/UL 181, Standard for Safety Factory-Made Air Ducts and Air Connectors, 2005 1996.UL Building Materials Directory, 2009 2002.

Standards update.

_______________________________________________________________________________________________90B- Log #10


B.1.2.3 UL Publications. Underwriters Laboratories Inc., 333 Pfingsten Road, Northbrook, IL 60062-2096.ANSI/UL 181, Standard for Safety Factory-Made Air Ducts and Air Connectors, 1996 2005, Revised 2008.UL Building Materials Directory, 2002 2009.

Update referenced standards to most recent revisions.


Documents

Attachment Page A...Stafford, VA 22554 U 7/26/2007 AIC-AAA Laurence W. Caraway, Jr. Principal Kitchen Klean Inc. AirDuct Clean 27 Black Hall Road PO Box 754 Epsom, NH 03234 National