Fume Hood Performance 2

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PROCEDURAL

STANDARDSFOR

FUME HOOD

PERFORMANCE

TESTING

2009 FIRST EDITION

NATIONAL

ENVIRONMENTAL

BALANCING

BUREAU


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PROCEDURAL

STANDARDS FORFUME HOOD

PERFORMANCE

TESTING

2009 FIRST EDITION

National Environmental Balancing Bureau

8575 Grovemont Circle

Gaithersburg, Maryland 20877-4121

301-977-3698

301-977-9589 FAX

www.nebb.org


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PROCEDURAL STANDARD FOR

FUME HOOD PERFORMANCE TESTING

Copyright NEBB, 2009

FIRST EDITION MARCH 2009

NEBB DEVELOPS AND SPECIFIES STANDARDS FOR TESTING OF FUME HOODPERFORMANCE. PERFORMANCE OF THESE SERVICES ONLY BY PERSONS THAT ARE

CERTIFIED OR QUALIFIED FOR ENGAGING IN THIS SPECIALTY IS ONE SUCHSTANDARD. NEBB SOLICITS INQUIRY BY ANY AND ALL PERSONS SEEKING SUCHAPPROVALS. FOR MORE INFORMATION, GO TO WWW.NEBB.ORG.

This book may not be reproduced in any form without written permission of thecopyright owner.

These Procedural Standards were developed using reliable engineering principles andresearch plus consultation with, and information obtained from, manufacturers, users,testing laboratories and others having specialized experience. They are subject torevision as further experience and investigation may show is necessary or desirable.Fume Hood Testing, which complies with these Procedural Standards, will not necessarilybe acceptable, if when examined and tested, it is found to have other features that impairthe result intended by these standards. The National Environmental Balancing Bureauassumes no responsibility and has no liability for the application of the principles ortechniques contained in these Procedural Standards. Authorities considering adoption ofthese Procedural Standards should review all Federal, State, local and contractregulations applicable to the specific installation.

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FOREWORDThe purpose of the NEBB Procedural Standards for Fume Hood Performance Testingis to establish auniform and systematic set of criteria for the performance testing of fume hoods.

This publication is the first edition of the Procedural Standard. Similar to the other NEBB disciplines,the Procedural Standard serves as the anchor for the program. Fume hoods and other safety controlenvironments, such as bio-safety cabinets, offer a distinct set of challenges to the firms andindividuals testing the field performance of these specialized, containment enclosures. The AmericanSociety of Heating, Refrigerating, and Air Conditioning Engineers (ASHRAE) has developed anANSI/ASHRAE Standard 110 Method of Testing Performance of Laboratory Fume Hoods. Anotherstandard is ANSI/AIHA Standard Z9.5 Laboratory Ventilation. These publications define the testingprocedures to be used when testing fume hoods and are well recognized and respected in this area ofexpertise. The NEBB discipline builds on these standards and complements them by providing aprogram that combines their testing requirements with a complete package for firm certification.

The NEBB Procedural Standard and the NEBB Fume Hood Testing program define the requirements

for firm certification, for Certified Professional educational and experience requirements, for reportingconsistencies, and for instrumentation requirements.

This Procedural Standard is similar to other NEBB Procedural Standards in that it is divided into twodistinct Parts: Standardsand Procedures. These FHT procedural standards have been developedusing language defined by Shall, Should, and May as it relates to the standards and proceduresdescribed in this manual. It is important to note these particular words throughout this manual andhow they pertain to the NEBB standards and procedures.

These standards and procedures are intended as the minimum NEBB requirements that a NEBBCertified FHT Firm shall follow when performing fume hood testing and reporting the results. Contractdocuments may supercede the NEBB requirements. These Procedural Standards have been

carefully compiled and reviewed by the NEBB Technical Committees.

Part 1 STANDARDSPart 1, STANDARDS, covers the requirements for Quality Control and Compliance, InstrumentationRequirements, and FHT Reports. The report requirements allow the NEBB Certified Firm moreflexibility in designing their reports by prescribing sets of information that "Shall, Shouldand/or May"be required to complete an FHT Report.

Part 2 PROCEDURESPart 2, PROCEDURES, covers required testing procedures to be followed when using ASHRAE 110and ANSI Z9.5. Part 2 also addresses criteria and testing procedures other than those dictated bythose referenced standards. This Procedural Standard allows that flexibility.

APPENDICESThe Appendices includes a suggested NEBB FHT specification, test illustrations, ejectorspecifications references and engineering formulas.

This Edition of the FHT Procedural Standards, when used by NEBB Certified FHT Firms, will assurethe building owner of standard, accurate reporting of fume hood performance.

Andrew P. Nolfo, P.E.NEBB Technical Director

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FUME HOOD COMMITTEE MEMBERS

AND OTHER CONTRIBUTORS FOR CURRENT EDITION

Current FHT Committee:

Bohdan (Don) Fedyk, ChairmanBuffalo, New YorkMichael J. KellyBethlehem, PennsylvaniaMichael L. LancetteSt. Paul Park, MinnesotaThomas R. McKeen, PESan Antonio, TexasDavid G. McFarlaneGrand Forks, North DakotaDavid MuggahSydney, Nova Scotia, Canada

W. David Bevirt, PETucson, ArizonaAndrew P. Nolfo, PEPhoenix, ArizonaAdditional Contributors to the First Edition:

Michael P. DolimGaithersburg, Maryland

Randall SilvaSan Jose, California

Michael A. WiederBethlehem, Pennsylvania

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V

TABLE OF CONTENTSPAGE

Foreword III

NEBB Fume Hood Testing Committee IVTable of Contents V

PART 1 STANDARDS

SECTION 1 Definitions 1

SECTION 2 NEBB Program, Quality Control and Compliance 72.1 NEBB Programs 7

2.1.1 NEBB Disciplines 7

2.1.2 Certification of Firms 72.1.3 Certification of Professionals 72.1.4 Recertification Requirements 8

2.2 Quality Assurance Program Conformance Certification 82.2.1 Program Advantages 82.2.2 NEBB Quality Assurance Program Certificate 8

2.3 Quality Control and Compliance 82.3.1 FHT Work Compliance 8

2.4 FHT Professional Responsibilities 92.4.1 Execution of FHT Procedures 92.4.2 Technician Training 102.4.3 FHT Procedures Training 10

2.4.4 Instrument Use and Maintenance 102.4.5 Coordination / Supervision 102.4.6 Project Communication 102.4.7 Work Completion 102.4.8 Compilation and Submission of Final FHT Reports 11

SECTION 3 Responsibilities 133.1 Introduction 133.2 Design and Construction Team Responsibilities 13

3.2.1 Design Professionals Responsibilities 133.2.2 Construction Team Responsibilities 143.2.3 NEBB Certified FHT Firm Responsibilities 14

SECTION 4 Standards for Instrumentation and Calibration 154.1 Minimum Instrumentation 154.2 Range and Accuracy 154.3 Calibration 15

Table 4-1 NEBB Minimum FHT Instrumentation Requirements 16


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NEBB FHT PROCEDURAL STANDARDS TABLE OF CONTENTS

VI

PAGESECTION 5 Standards for Reports and Forms 19

5.1 Reports 195.2 Required Forms 19

5.2.1 Report Title 19

5.2.2 Report Certification 205.2.3 Table of Contents 205.2.4 Report Summary / Remarks 215.2.5 All Report Pages 215.2.6 Instrument Calibration 215.2.7 Abbreviations 215.2.8 Airflow Velocity Test Report Data Constant

Volume Systems 225.2.9 Airflow Velocity Test Report Data VAV Systems 225.2.10 Airflow Visualization Test Report Data Local Challenge 235.2.11 Airflow Visualization Test Report Data Large Volume

Challenge 23

5.2.12 Tracer Gas Containment Test Report Data Static Mode 235.2.13 Tracer Gas Containment Test Report Data Sash Movement

Effect 245.2.14 Tracer Gas Containment Test Report Data Perimeter Scan 245.2.15 Other Fume Hood Performance Test Report Data 24

PART 2 - PROCEDURES

SECTION 6 Laboratory and Cleanroom Safety 256.1 Introduction 25

6.2 Designing A Program Policy Health and Safety 256.2.1 Designing a Program Policy 256.2.2 Designing a Training Program 266.2.3 Essentials of the Health and Safety Program 26

6.3 Responsibilities 276.3.1 Individual Health and Safety Responsibilities 27

6.4 Elements Of The Program 286.4.1 Project Specific Items 286.4.2 Health and Safety Program Implementation 28

SECTION 7 Laboratory and Cleanroom Protocol 297.1 Introduction 29

7.2 Laboratory And Cleanroom Procedures 297.2.1 Gowning Procedures 297.2.2 Equipment Entrance Procedures 307.2.3 Laboratory / Cleanroom Conduct 30

Section 8 Overview of Testing Requirements 318.1 Introduction 318.2 Test Setup Procedures 31


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VII

PAGE8.2.1 Fume Hood Types 318.2.2 Fume Hood Sash Configurations 328.2.3 Test Setups 32

8.3 ANSI/ASHRAE Standard 110 33

8.4 ANSI/AIHA Standard Z9.5 348.5 Preliminary Test Procedures 34

SECTION 9 Airflow Velocity Test Procedures 359.1 Introduction 359.2 Airflow Velocity Tests Constant Air Volume (CAV) Fume Hood 35

9.2.1 Instruments and Equipment 359.2.2 Test Procedures (Average Airflow Face Velocity) 359.2.3 Acceptance 369.2.4 Reporting 36

9.3Airflow Velocity Tests Variable Air Volume (VAV) Fume Hood 369.3.1 Instruments and Equipment 36

9.3.2 Test Procedures (Average Airflow Face Velocity) 379.3.3 Test Procedures (Response Time) 389.3.4 Acceptance 399.3.5 Reporting 39

SECTION 10 Airflow Visualization Test Procedures 4110.1 Introduction 4110.2 Airflow Visualization Tests Local Challenge 41

10.2.1 Instruments and Equipment 4110.2.2 Test Procedures 4110.2.3 Acceptance 42

10.2.4 Reporting 4210.3 Airflow Visualization Tests Large Volume Challenge 4210.3.1 Instruments and Equipment 4210.3.2 Test Procedures 4310.3.3 Acceptance 4310.3.4 Reporting 43

SECTION 11 Tracer Gas Containment Test Procedures 4511.1 Introduction 4511.2 Tracer Gas Containment Tests 45

11.2.1 Instruments and Equipment 4611.2.2 Test Procedures (Static Mode) 46

11.2.3 Acceptance (Static Mode) 4711.2.4 Reporting (Static Mode) 4811.2.5 Test Procedures (Sash Movement Effect) 4811.2.6 Acceptance (Sash Movement Effect) 4811.2.7 Reporting (Sash Movement Effect) 4911.2.8 Test Procedures (Perimeter Scan) 4911.2.9 Acceptance (Perimeter Scan) 4911.2.10 Reporting (Perimeter Scan) 49


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VIII

PAGESECTION 12 Optional Tests and Procedures 51

12.1 Introduction 5112.2 Other Tests and Procedures 5112.3 Supplementary Tests and Procedures 51

12.3.1 Room Airflow Velocity Tests 5112.3.2 Temperature/Humidity Uniformity Tests 5212.3.3 Sound and Vibration Level Tests 5212.3.4 Cross Draft Condition Tests 5212.3.5 Other Tests 53

APPENDICES

APPENDIX A Sample FHT Specification IAPPENDIX B Example Test Illustrations XXI

APPENDIX C Ejector System Specifications XXVAPPENDIX D References and Referenced Publications XXIIIAPPENDIX E Engineering Formula and Examples XXXV


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1

PART 1 - STANDARDS

SECTION 1 DEFINITIONSThese procedural standards have been developed using language defined by Shall, Should,and May" as it relates to the standards and procedures described in this publication. It isimportant to note these particular words throughout this publication and how they pertain toNEBB standards and procedures.

Acceptance Criteria: The value or range of values which is compared to the measured value that willdetermine if the results of the test pass or fail.

Accuracy: The capability of an instrument to indicate the true value of a measured quantity.

AHJ: The local governing Authority Having Jurisdiction over the installation.

Air Supply Fixtures:Devices or openings through which air flows into the laboratory room. For thepurpose of this standard all accessories, connecting duct adapters, or other mounting airways shall beconsidered part of the supply fixture and reported as a unit or an assembly. Some specific supplyfixtures are defined as follows:

grille: a louvered or perforated face over an opening.register: a combination grille and damper assembly.diffuser: an outlet designed to mix supply air and room air and to distribute it in varying directions.perforated ceiling: a ceiling with perforated panels used to distribute the air uniformly throughoutthe ceiling or a portion of the ceiling. Filter pads may be used to achieve a similar result.

Auxiliary Air: Unconditioned or partially conditioned supply or supplemental air delivered to alaboratory at the laboratory fume hood to reduce room air consumption.

Calibrate: The act of comparing an instrument of unknown accuracy with a standard of knownaccuracy to detect, correlate, report, or eliminate by adjustment any variation in the accuracy of thetested instrument.

Control Level: The average measured concentration of tracer gas, in parts of tracer gas per millionparts of air by volume (ppm), that is not exceeded at the hood face with a 4.0 Lpm release rate.

Deficiency: Any circumstance or operation that affects the measurement results as compared to thedesign criteria required by the contract documents.

Design Sash Opening: The position of the sash at which the design team assumes that the fumehood will be operating.

Face Velocity: The average velocity of air moving perpendicular to the hood face, usually expressedin feet per minute (fpm) or meters per second (m/s).


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NEBB FHT PROCEDURAL STANDARDS SECTION 1

DEFINITIONS

2

Fume Hood (sometimes referred to as a laboratory hood): A box-like structure enclosing a sourceof potential air contamination, normally with one open or partially open side, into which air is movedfor the purpose of containing and exhausting air contaminants. A fume hood is generally used forbench-scale laboratory operations but does not necessarily involve the use of a bench or table.

Fume Hood System: An arrangement consisting of a fume hood, its adjacent room environment,

and the air exhaust equipment, such as blowers and ductwork, required to make the hood operable.

Function: For the purposes of this NEBB Standard, function refers to the specific type of datameasurement specified in Section 4, Standards for Instrumentation and Calibration.

High Value of Range: The maximum response time divided by the average response time of theVAV Response Time Test. Value is expressed as a percentage.

Hood Face: The plane of minimum area at the front portion of a laboratory fume hood through whichair enters when the sash(es) is (are) fully opened, usually in the same plane as the sash for a hoodwith a vertical sash. For a hood with horizontal sash(es) or a combination sash, the hood face isusually the plane passing through the midpoint between the inner and outer sashes.

Lazy Airflow: Airflow within the hood is described as lazy when smoke remains on the work surfacewithout smoothly flowing to the back baffle.

LPM: Liters per minutes.

Low Value of Range: The minimum response time divided by the average response time of the VAVResponse Time Test. Value is expressed as a percentage.

May: Used to indicate a course of action that is permissible as determined by the NEBB CertifiedFHT Firm.

Maximum Sash Opening: The position of the sash at which the fume hood has the largest opening.

N/A: Not Available, Not Applicable, or Not Accessible. The simple notation N/A without definition isnot allowed.

NEBB Certified FHT Firm: A NEBB Certified FHT Firm is a firm that has met and maintains all therequirements of the National Environmental Balancing Bureau for firm certification in Fume HoodPerformance Testing and is currently certified by NEBB. A NEBB Certified FHT Firm shall employ atleast one NEBB Certified FHT Professional in a full time management position.

NEBB Certified FHT Report: The data presented in a NEBB Certified FHT Report accurately

represents system measurements obtained in accordance with the current edition of the NEBBProcedural Standards for Fume Hood Performance Testing. A NEBB Certified FHT Report does notnecessarily guarantee that systems measured conform to the design requirements or statedguidelines. The report is an accurate representation of the measured results only.

NEBB Certified FHT Professional: A NEBB Certified FHT Professional is a full time employee ofthe firm in a management position who has successfully passed the professional level written andpractical qualification examinations and maintains the Certified FHT Professional recertificationrequirements of NEBB.


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DEFINITIONS

3

Operating Sash Opening: The position of the sash at which the fume hood user places the sashwhile working at the face of the fume hood. The operating sash opening should take intoconsideration all of the procedures to be conducted in the fume hood. There may be more than oneoperating sash opening.

Performance Rating: Rating definition of the Static Mode Test portion of the Tracer Gas Tests. It iscomprised of a series of letters and numbers consisting of the letters AM, AI, or AU, and three-digitnumber:

AM yyyAI yyyAU yyy

Where:

AM indicates the test setup is "As Manufactured,"AI indicates the test setup is "As Installed,"AU indicates the test setup is "As Used,"yyy indicates the control level of tracer gas established by the test in ppm.

As an example: A test rating of AU 0.500 would indicate that the fume hood controls theleakage into the laboratory to 0.500 ppm at the mannequin's sensing point with a tracer gasrelease rate of 4.0 Lpm.

Positional Sash Movement Effect Control Level: The maximum 45-second moving average of thetracer gas concentration observed during a series of sash movement tests at one ejector andmannequin position.

Positional Control Level: The average tracer gas concentration at a position during a test.

Precision: The ability of an instrument to produce repeatable readings of the same quantity under

the same conditions. The precision of an instrument refers to its ability to produce a tightly groupedset of values around the mean value of the measured quantity.

PPM: Parts per million.

Procedure: The approach to and execution of a sequence of work operations to yield a repeatableand defined result.

Range: The upper and lower limits of an instruments ability to measure the value of a quantity forwhich the instrument is calibrated.

Relative Range: The range from the Low Value of Range to the High Value of Range. Reported as

percentages.

Release Rate: The rate of release, in actual liters (litres) per minute (Lpm), of tracer gas during ahood test.

Repeatability: The difference from the Low Value of Range to the High Value of Range. Reported asa percentage.

Resolution: The smallest change in a measured variable that an instrument can detect.


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DEFINITIONS

4

Reverse Flow: Airflow within the hood when smoke released in the hood moves forward toward thefront of the hood. This term does not apply to the forward motion of the roll inside the hood thatoccurs in the upper cavity of the hood above the hood opening or to the cyclonic motion that occursbehind a closed horizontal sash.

Roll: The rotation of air, commonly referred to as vortex, in the upper cavity of the hood. The roll isinduced by the momentum of the air entering the hood through the hood opening.

Sash Movement Effect: The maximum of the positional sash movement effects for all the positionstested on a particular hood.

Sash Movement Effect Performance Rating: Rating definition of the Sash Movement Effect Testportion of the Tracer Gas Tests. It is comprised of a series of letters and numbers consisting of theletters SME-AM, SME-AI, or SME-AU, and three-digit number:

SME-AM yyySME-A I yyy

SME-AU yyyWhere:

SME means "sash movement effect,"AM indicates the test setup was "As Manufactured,"AI indicates the test setup was "As Installed,"AU indicates the test setup was "As Used,"yyy equals the sash movement effect, in ppm.

For example: A test rating of SME-AI 10.0, indicates the fume hood was tested in the As-Installed test setup and that the maximum 45-second rolling average concentration of tracergas measured during a sash movement test was 10.0 ppm with a tracer gas release rate of

4.0 Lpm .

Shall: The term is used to indicate mandatory requirements that must be followed in order for theproject to become a NEBB certified project. Work must conform to these standards and proceduresand no deviation is permitted. Note: In the event unique circumstances prevent a required action frombeing fulfilled, a notation shall be included in the FHT report explaining the reason that therequirement was not completed. For example, such notation could be one of the following:Not Available, Not Applicable, or Not Accessible. The simple notation N/A without definition is notallowed.

Should: The term is used to indicate that a certain course of action is preferred but not necessarilyrequired.

Specified Rating: The hood performance rating as specified, proposed, or guaranteed either in thepurchase of the hood or in the design and construction of the laboratory, or both.

Standard: A required qualification, action, or result for FHT work.

Standard Operating Procedure: An internal policy prepared by the each FHT firm and / or preparedby the Owner/Buyer. Procedures are written to provide guidance, direction, and step-by-step details


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DEFINITIONS

5

relating to issues such as safety, testing protocols, acceptance criteria, etc. NEBB FHT Firm SOPsshall be utilized in an absence of SOPs prepared by the Owner.

Test Sash Opening: The position or positions of the sash at which the fume hood is tested.

Test Setup (Test Setup Mode): Defines the condition of the fume hood being tested. There are

three distinct conditions that the fume hood may be tested:

As-Manufactured (AM): With this test setup, the fume hood is tested at the manufacturersfacility or under conditions that would replicate those conditions. The hood and work surfaceshall be void of all process equipment, apparatus and chemicals.

As-Installed (AI): With this test setup, the actual fume hood is tested in its installed, operatingcondition. All supply, exhaust and return air systems are installed, operable and under control.The hood and work surface shall be void of all process equipment, apparatus and chemicals.

As-Used (AU): This test setup is the same as the As-Installed setup except the hood is beingutilized for actual process work. Experiment equipment, chemicals and processes are being

carried out inside the hood while the fume hood performance testing is being performed. Thismeans that all normal operating equipment within the hood shall be activated and operationalincluding items such as all heat and vapor producing appliances, physical obstructions, etc.

Testing: The use of specialized and calibrated instruments to measure fluid quantities, temperatures,pressures, rotational speeds, electrical characteristics, velocities, and sound and vibration levels,

Testing, Adjusting, and Balancing (TAB): A systematic process or service applied to heating,ventilating and air-conditioning (HVAC) systems and other environmental systems to achieve anddocument air and hydronic flow rates. The standards and procedures for providing these services areaddressed in the current edition of the NEBB PROCEDURAL STANDARDS FOR THE TESTING,ADJUSTING AND BALANCING OF ENVIRONMENTAL SYSTEMS.

VAV Speed of Response: The time, measured from the first movement of the sash, for the VAVsystem to restore the slot velocity or airflow to 90 percent of the average steady-state value.

VAV Time to Steady State: The time, measured from the first movement of the sash, for the VAVsystem to restore and maintain the average slot velocity of airflow between 90 and 110 percent of theaverage steady-state value.

WorkSurface: The surface that the fume hood sets on.


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DEFINITIONS

6


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7

SECTION 2 NEBB PROGRAM,

QUALITY CONTROL AND

COMPLIANCE2.1 NEBB PROGRAMS

The National Environmental Balancing Bureau (NEBB) is a not-for-profitorganization founded in 1971to:

a) develop standards, procedures and programs for the performance of testing, balancing andcommissioning of building systems,

b) promote advancementof the industry through technical training and development,c) operate programs to certify firms and qualify individuals who meet and maintain NEBB

standards with integrity.

Additional information on NEBB Programs is available atwww.nebb.org .

2.1.1 NEBB DISCIPLINES

NEBB establishes and maintains standards, procedures , and specifications for work in its variousdisciplines, which include:

a) Testing-Adjusting-Balancing (TAB) -- Air and Hydronic Systemsb) Sound (S) Measurementc) Vibration (V) Measurementd) Cleanroom Performance Testing (CPT)

e) Building Systems Commissioning (BSC)f) Fume Hood Performance Testing (FHT)g) Retro-Commissioning (RCx-EB)

Each discipline is anchored by a NEBB Procedural Standards manual that provides guidelines forwork to be performed. NEBB also has created technical manuals, training materials and programs,and seminars to enhance and supporteach discipline.

2.1.2 CERTIFICATION OF FIRMS

NEBB certifies firms that meetcertain criteria, ensuring strictconformance to its high standards andprocedures. Among other requirements, NEBB Certified FHT Firms must document a record ofresponsible performance, own a complete set of instruments and equipment required for the

sophisticated techniques and procedures necessary to take and report fume hood testingmeasurements, and have a NEBB Certified FHT Professional as a full-time employee.

2.1.3 CERTIFICATION OF PROFESSIONALS

NEBB also establishes professional qualifications fo r the supervision and performance of work in itsvarious disciplines. NEBB Certified FHT Profe ssionals must have extensive experience, and theymust pass appropriate, college-level written examinations and demonstrate certain practical workingknowledge and proficiency in the use of instruments required for the various disciplines.


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NEBB PROGRAM, QUALITY CONTROL

AND COMPLIANCE

8

2.1.4 RECERTIFICATION REQUIREMENTS

Through the recertification procedures, the firm mustverify thatits NEBB Certified FHT Professional isstill on staff and that itcontinues to own a complete se tof instruments thatare in currentcalibration.In addition, the firm's NEBB Certified FHT Profe ssional renews his or her certification annually.

Among other requirements, the Certified Professional must keep abreast of developments in theirdiscipline by successfully completing continuing education requirements annually.

2.2 QUALITY ASSURANCE PROGRAM - CONFORMANCE CERTIFICATION

The credibility of NEBB is builtby maintaining in tegrity through high standards, quality programs, anddemonstrated capabilities of its certified firms. As further assurance, NEBB offers a QualityAssurance Program to guarantee thatthe work will be accomplished in accordance with its standards.NEBBs Quality Assurance Program applies to each proj ect. Itassures that the NEBB Certified Firmwill perform specified services in conformity with the currentapplicable NEBB Procedural Standards.

2.2.1 PROGRAM ADVANTAGES

The NEBB Quality Assurance Program affords building owners, architects, engineers and otheragents a reliable basis for specifying work within the various disciplines of NEBB. The programpromotes proper execution of projects by ensur ing compliance with NEBB standards and procedures.

2.2.2 NEBB QUALITY ASSURANCE PROGRAM CERTIFICATEThe NEBB Quality Assurance Program Conformance Certificate is not required, but is available forany project.

2.3 QUALITY CONTROL AND COMPLIANCE

Building owners are entitled to a professional service by every NEBB Certified Firm on every project,whether the job is NEBB-specified or not. It is the responsibility of the NEBB Certified FHT Firm and

its NEBB Certified FHT Professional to establis h and maintain procedures and practices that willassure a consistentpattern of high quality work on all projects. This pointcannotbe overemphasized.

2.3.1 FHT WORK COMPLIANCE

Either the design professional or the owner / buyer should adequately define the scope of the fumehood performance testing services. Many of today s contract documents do not define the actualscope of services to be performed on the project. Contract documents may reference desiredprocedures and may include statements such as "the work will be performed in accordance toNEBB Standards" or, the contract documents may refer to NEBB and that fume hood performancetesting work shall be done in accordance with the reference standard or, merely allude to theNEBB organization, ASHRAE, or ANSI, or owne r / buyer defined reference standards and makereference to fume hood performance testing work.

When contract documents do not clearly identify the exact scope of fume hood performance testingservices, the NEBB Certified FHT Professional shall make every attempt to have the designprofessional, or the owner / buyer, dictate the actual scope of work.

Regardless of what is the scope of work, in all cases the process by which the data is acquired shallconform to the current edition of the NEBB Procedural Standards for Fume Hood PerformanceTesting.


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AND COMPLIANCE

9

References to desired procedures may include statements such as "the work will be performed inaccordance to NEBB Standards." When specifications indicate that the fume hood testing work shallbe performed in accordance with NEBB standards, t he FHT procedures will conform to the currentedition of the NEBB Procedural Standards for Fume Hood Performance Testing and must be

performed by a NEBB certified firm .

The scope of work shall be performed as specified in the contractdocuments or as agreed to betweenthe owner / buyer and the NEBB Certified FHT Firm. Ea ch relevantor applicable item as identified inthe scope of work shall be performed and recorded in NEBB FHT Final Report. Data presented in theNEBB FHT Final Report shall provide an accurate record of the system tests, measurements, dataand information.

a. The NEBB Certified FHT Firm and the NEBB Cert ified FHT Professional are allowed to signand stamp a fume hood testing report as a NEBB Certified FHT Report only when theprocedures and requirements as identified in these Procedural Standards have been followed.

b. A NEBB Certified FHT Report should consist of all three primary fume hood tests (AirflowVelocity Tests, Airflow Visualizations Tests, and Tracer Gas Containment Tests), but mayconsist of any single primary test or any combination of primary tests as described in theseProcedural Standards. To qualify as a NEBB Certified Report, the procedures andrequirements for each primary testincluded in the report SHALLadhere to the requirements ofthese Procedural Standards.

c. For some projects, the scope of work of the fume hood testing may require testingrequirements, procedures, reporting requirements, etc. that are different from those requiredby this Procedural Standard. The scope of work may require testing to another industrystandard or an owner / buyer defined set of testing requirements. For these projects, theCertified FHT Final Report MAYbe signed and stamped as a NEBB Certified FHT Reportonlyif the procedural variances are clearly delineated in the projectscope of work and identified onthe reportCertification Page. See Section 5.2.2.

d. Any project thatdoes notcomply with the minimum SHALL requirements of this standard anddoes not clearly identify the specific procedural variances required by the fume hood testingcontract on the certification page SHALL NOTbe signed and stamped as a NEBB certifiedFHT report. All references to NEBB, including NEBB logos, stamps, certifications, etc. SHALLbe removed from the report.

2.4 FHT PROFESSIONAL RESPONSIBILITIES

It is the responsibility of the NEBB Certified FHT Pr ofessional to control the quality of the fume hood

performance testing work. This means that the NEBB Certified FHT Firm, through its NEBB CertifiedFHT Professional, shall satisfy the contract obligations set forth in the drawings and applicablespecifications.

2.4.1 EXECUTION OF FUME HOOD TESTING PROCEDURES

The NEBB Certified FHT Professional shall have pr oject responsibility, which includes authority torepresent the NEBB Certified FHT Firm. Exampl es of project responsibility may include labordecisions, negotiating change orders, committing to contract interpretations and implementingchanges in job schedules.


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AND COMPLIANCE

10

The NEBB Certified FHT Professional has the responsib ility to assure that the measurements of thefume hood performance testing have been performed in accordance with these Procedural Standardsand the contract documents to assure the accuracy of all data included in the final report. Factorssuch as instrumentuse, coordination / supervision, work instructions, and projectcommunication play

a critical role in achieving this requirement.

2.4.2 TECHNICIAN TRAININGThe NEBB Certified FHT Professional has a responsibility to assure that technicians performing thework are properly trained and possess sufficientskills . Areas thatshould be stressed are fume hoodperformance testing procedures, instrument use and maintenance, safety procedures, coordinationand supervision, and projectcommunication.

2.4.3 FHTPROCEDURES TRAININGNEBB Certified FHT Professionals must be prepared to completely measure and record data in themanner specified. It is mandatory that NEBB Ce rtified FHT Professionals possess the ability toperform the specific tasks and procedures requir ed for each project. An understanding of building

system fundamentals and operating characteristic s is important, and technicians should possessrudimentary knowledge of all related systems and procedural considerations. This may requireperiodic training to promote knowledge and skill development as well as to facilitate the transfer ofknowledge and basic skills in the use of new technology.

2.4.4 INSTRUMENT USE AND MAINTENANCENEBB Certified FHT Professionals shall possess know ledge and skill in the proper use and care ofinstruments required to perform the work. This shall include a thorough understanding of theoperating principles and use of fume hood equipment and instruments. Considerations for thedelicate nature of many of the instruments typically us ed, as well as the adverse effects of dirt, shock,

jarring movements and exceeding rated capacities, shall be addressed along with the proper methodsfor storing and transporting the instruments.

2.4.5 COORDINATION / SUPERVISIONThe NEBB Certified FHT Professional shall be respons ible for directing technicians in performing thework. Instructions may delineate items such as the scope of work, location, type and quantity ofmeasurements, etc. so thatfield personnel may know ex actly whatto do and whatis required of them.

2.4.6 PROJECT COMMUNICATIONThe NEBB Certified FHT Professional shall report on progress made toward work completion, whenrequired, as well as reportand address problems if encountered. When a problem exists, the NEBBCertified FHT Professional should notify the appropriate projectpersonnel.

2.4.7 WORK COMPLETION

The NEBB Certified FHT Professional shall determine when the fume hood performance testing workhas been completed, and when to submitthe report. Generally, the specified fume hood performancetesting field work is complete when:

a) All specified fume hood performance testing is completed;

or

b) Reasonable efforts within the extentof testing for fume hoods have been performed in an effort


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to complete all required measurements. The NEBB Certified FHT Professional shall notify theappropriate project personnel of any significa nt system deficiencies preventing fume hoodperformance testing from being performed before the final reportis submitted.

2.4.8 COMPILATION AND SUBMISSION OF FINAL FHT REPORTS

Reports shall include information and data to provide an accurate quantitative and qualitative recordof system measurements and information. R eports also shall include notes and comments, asappropriate, to provide the reviewer with additional details related to the test procedure, systemoperation and results. Reports shall meetthe criteria listed in Section 5.

The certification page shall bear the stamp of the NEBB Certified FHT Professional. The stamp onthe certification page shall be signed as evidence that the NEBB Certified FHT Professional haspersonally reviewed and accepted the report. Signature stamps are specifically prohibited.


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SECTION 3 RESPONSIBILITIES

3.1 INTRODUCTION

Many approaches can be taken to deliver successful performance testing of fume hoods on a project.In order to maximize value and benefits from fume hood performance testing, it is important tounderstand that the design professionals and other construction team members have responsibilitiesthat will affect the outcome of the fume hood testing process.

The following outline represents recommended practices that may take place on a conventionaldesign/bid/buy/construct delivery project or on a direct procurement project between the Owner/Buyerand the NEBB Certified FHT Firm. While other delivery approaches exist, the overall concept of thedelineation of responsibilities remains. The Owner/Buyer must be the responsible party that dictatesthe recommended following procedures.

3.2 DESIGN AND CONSTRUCTION TEAM RESPONSIBILITIES

3.2.1 DESIGN PROFESSIONALS RESPONSIBILITIES

It is recommended that the contract documents must:

a) Specify the equipment, systems and scope of testing services to be performed for the fumehoods on the project. NEBB standards and procedures define industry best practices toperform the measurements.

b) Define who retains the services of the NEBB Certified FHT Firm and require that the NEBBCertified FHT Firm be retained early in the construction process.

c) Clearly define on the contract documents all fume hood performance testing requirementsincluding setup mode, design sash opening, acceptance criteria and reporting requirements.

d) Clearly identify on the contract documents all locations where fume hood performance testingis to be performed.

e) Specify that the building, mechanical, electrical and all associated work is to be completedprior to performing fume hood performance testing.

f) Specify that all building, mechanical, electrical, and other systems are completely operational,under control and performing according to the design intent prior to performing fume hoodperformance testing. This would include that all building automation / controls are installed,

operational, calibrated and functioning properly and that the TAB work is completed. Fumehood performance testing performed prior to completion of these activities should be avoided.Actual final measurements may differ from measurements taken prior to the completion of thework.

g) Provide adequate access to all equipment and components required by the fume hoodperformance testing process.


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3.2.2 CONSTRUCTION TEAM RESPONSIBILITIES

It is recommended that the construction team must:

a) Provide the NEBB Certified FHT Firm with a conformed set of contract documents (drawings,specifications, and approved submittals), including all current approved change orders and

contract modifications.

b) Develop a project schedule, with the input of the NEBB Certified FHT Firm that coordinates thework of other disciplines and provides adequate time in the construction process to allowsuccessful completion of the fume hood performance testing work.

c) Notify the NEBB Certified FHT Firm of allschedule changes.

d) Ensure that the building enclosure is complete, including but not limited to, all structuralcomponents, windows and doors installed, door hardware complete, floor and ceilingscomplete. Ensure that the building enclosure and components are complete and operationalsuch that the performance of the fume hoods would not be adversely affected.

e) Ensure that all necessary building systems are complete and are operating in a safe manner.

f) Complete the installation of permanent electrical power systems serving the building systems.Such electrical systems shall be properly installed in accordance with all applicable codes toensure the safety of all construction personnel.

g) Perform start up of all building systems in accordance with manufacturers' recommendations.

h) Complete the installation, programming (including design parameters and graphics),calibration and startup of all building control systems. Verify that the building control systemprovider has commissioned and documented all building control work.

i) Complete all TAB related work. A copy of the completed TAB Report shall be furnished to theNEBB FHT Firm. If this is a recertification project, provide the NEBB FHT Firm with a copy ofthe most recent TAB Report or the most recent Fume Hood Performance Test Report.

3.2.3 NEBB CERTIFIED FHT FIRM RESPONSIBILITIES

The NEBB Certified FHT Firm SHALL:

a) Follow the current NEBB standards and procedures when performing the fume hoodperformance testing.

b) Communicate on a regular basis, through proper channels, items pertaining to design,installation or function that prevent the NEBB Certified FHT Firm from achieving completion of

the FHT work in accordance with the current edition of the NEBB Procedural Standards forFume Hood Performance Testing.

c) Perform the required fume hood performance tests.

d) Publish a NEBB Certified FHT Report of final conditions that accurately reflect the results ofthe fume hood performance testing.


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SECTION 4 STANDARDS FOR

EQUIPMENT,

INSTRUMENTATION ANDCALIBRATION4.1 MINIMUM INSTRUMENTATION

A NEBB Certified FHT Firm will use a variety of instrumentation to perform the specified fume hoodperformance tests on a project. It is the responsibility of the NEBB Certified FHT Firm to provideappropriate instrumentation that meets the minimum requirements for use on a project.Instrumentation used on a NEBB project shall be in proper operating condition and shall be applied in

accordance with the manufacturers recommendations. Table 4-1 lists the minimum instrumentationspecifications that a NEBB Certified FHT firm shall utilize in all fume hood performance testing. TheNEBB Certified FHT Firm shall own all of the required instrumentation and equipment as identified inTable 4-1.

4.2 RANGE AND ACCURACY

The accuracy and range as reported by the instrument manufacturer shall be verified by a testinglaboratory traceable to the National Institute of Standards and Technology or equivalent institute incountries other than the United States. Calibration requirements for each function are specified andshall be met. Some instruments and accessories may not require calibration. However, if a"mechanical / electrical" device is substituted or employed in place of these types of instruments, theindicated calibration requirements noted shall apply. Instrumentation with multiple capabilities shallbe accepted for more than one function when submitting documentation for a firms certification,providing that each separate function meets NEBB requirements.

4.3 Calibration

Annual Calibration ALL fume hood performance testing instrumentation SHALL be maintained witha current annual calibration certificate, traceable to the National Institute of Standards and Technology(NIST), or equivalent organizations in other countries, or manufacturers specifications, whichever ismore stringent.

Firms with multiple sets of instrumentation SHALL calibrate all instrumentation used by the firm onFHT projects in accordance with Table 4-1 as a minimum requirement for NEBB certification.


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TABLE 4-1 NEBB MINIMUM FHT INSTRUMENTATION REQUIREMENTS

Test Instruments &Equipment

Description CalibrationInterval

Linear Measuring Device Minimum 12 (3.6 m) tape measure capable of

reading 1/16 (1.0 mm) increments

Not Required

Equipment Stand Stationary stand (ring stand) that will allow theairflow face velocity measuring device to besecured.

Not Required

A digital manometer and either an array-typegrid or airfoil-type probe. The manometer shallhave the following characteristics:

Range: 25 to 2500 fpm (0.127 to 12.7 m/s)Accuracy: 5% of reading (5 fpm @100 fpm)

( 0.0254 m/s @ 0.508 m/s)Resolution: 1 fpm (0.00508 m/s)Data Interval: Instrument shall be capable of

data logging and data output at a minimum ofone (1) second intervals.

12 Months(Meter only)

Airflow

Velocity Tests AverageFace Velocity(CAV & VAV)(Sections 9.2 &9.3)

Airflow Velocity Instrument(One of the following Shallbe provided)

A digital thermal anemometer with the followingcharacteristics:

Range: 0 to 6000 fpm (0 to 30.5 m/s)Accuracy: 3 % or 3 fpm (0.0152 m/s)

(whichever is greater)Resolution: 1 fpm (0.00508 m/s)Data Interval: Instrument shall be capable ofdata logging and data output at a minimum ofone (1) second intervals.

12 Months

Equipment Stand Stationary stand (ring stand) that will allow theairflow face velocity measuring device to besecured.

Not Required

A digital thermal anemometer with the followingcharacteristics:

Range: 0 to 6000 fpm (0 to 30.5 m/s)Accuracy: 3 % or 3 fpm (0.0152 m/s)

(whichever is greater)Resolution: 1 fpm (0.00508 m/s)Data Interval: Instrument shall be capable ofdata logging and data output at a minimum ofone (1) second intervals.

12 Months

AirflowVelocity Tests ResponseTime (VAV)(Section 9.3 Velocity Measuring

Instrument(One of the following Shallbe provided)

Digital manometer with either a Pitot tube or anairfoil-type probe. The digital manometer shall

be capable of storing / downloading data to acomputer or printer and shall have the followingcharacteristics:

Range: -15.0 to +15.0 inches w.c.(-3.7 to + 3.7 kPa)

Accuracy: 1 % of reading and 0.005 inchesw.c. (1.25 Pa)

Resolution: 0.001 inch w.c. (0.25 Pa)Data Interval: Instrument shall be capable ofdata logging and data output at a minimum ofone (1) second intervals.

12 Months(Meter Only)


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Puffer Disposal flexible dispenser containingpowder-based material

Not Required

Smoke Pen Smoke emitting wick Not RequiredSmoke Stick/Bottle - A smoke stick/bottlecontaining titanium tetrachloride.

Not Required

Small Smoke Source(One of the following Shallbe provided)

Other Smoke Source - Any device that cangenerate a small relatively neutrally buoyantsmoke source.

Not Required

Air FlowVisualizationTests Local

Challenge(Section 10.2)

Video Recorder (Optional) Not Required

An aerosol generator that can aerosolizeartificial liquid medium utilizing compressed airand Laskin nozzle.

Not RequiredLarge Smoke SourceGenerator(one of the following Shallbe provided)

Smoke Generator, such as a theatrical smoke

generator with a fluid approved by the owner,designer or AHJ.

Not Required

Air FlowVisualizationTests LargeVolumeChallenge

(Section 10.3)


Detection Calibrator A device used to calibrate the detectioninstrument in accordance with manufacturersspecifications.

WhenRequired

Ejector System w/criticalorifice

Ejector system with critical orifice Shall conformto the requirements as indicated in the currentedition of ASHRAE Standard 110. SeeAppendix C for instrument specifications.

Not Required

Mechanical device

Range: 0 15 L/mAccuracy: 0.1 L/mResolution: 0.1 L/m

12 monthsOrifice Calibrator

(One of the following Shallbe provided)

Flow Meter (measurements shall be adjusted forspecific tracer gas)Range: 1 10 L/mAccuracy: 3%Resolution: 0.5 L/m

Not Required

Sulfur Hexaflouride (SF6) Commercial grade(Minimum purity of 99%)

Not Required

Tracer GasContainmentTests(Section 11.2)

Tracer Gas(One of the following Shallbe provided)

Other acceptable gas may be used and shouldbe approximately the same molecular weight,stability, and grade as SF6. Other acceptablegas shall be approved by the owner, designer,or AHJ.

Not Required


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Mannequin A three-dimensional mannequin (torso) shall befully clothed that would replicate a normaloperator complete with laboratory coat. The

height must be adjustable to meet the heightrequirements of the various hood configurations;i.e. standard bench hood, ADA height, walk, etc.Probe shall be placed in the normal breathingzone based on the various heights.

Not Required


Spectrophotometer - A digital, single beam,infrared spectrophotometer consisting of aportable gas analyzer and a separate ac/dcconverter. The spectrophotometer must becapable of measuring sulfur hexaflouride (SF6),or other approved tracer gas and display inconcentration measurement units (ppm).

The minimum response time shall be 1 secondand capable of interfacing with a data logger /computer to collect readings.

Accuracy: 15% of reading between five timesminimum detectable concentration and theupper value range.Noise: Maximum of 0.004 absorbance units(AU) with 20.25 m pathlengths at 12.0 mwavelength and with AgBr lenses at 75F (23C) operating temperature.Drift: Maximum of 0.004 AU per 8 hours

The internal diameter of the probe tip shall beless than 0.5 inches (12mm).

The detection instruments calibration shall becapable of being field-verified.

12 Months

Tracer GasContainmentTests (Contd)

(Section 11.2)

Tracer Gas DetectionInstrument(One of the following Shallbe provided)

Electron Capture Detector (Leak Meter) Theunit shall be configured to measure sulfurhexaflouride (SF6), or other approved tracer gasand display in concentration measurement units(ppm).

The minimum detection range shall be 0.01 ppmThe minimum resolution shall be 0.01 ppmThe minimum response time shall be 1 secondand capable of interfacing with a data logger /computer to collect readings.

The minimum accuracy shall be 25% forreadings between 0.05 ppm to 0.1 ppm and 10% for readings above 0.1 ppm

The internal diameter of the probe tip shall beless than 0.5 inches (12mm).

The detection instruments calibration shall becapable of being field-verified.

12 Months


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SECTION 5 STANDARDS FOR

REPORTS AND FORMS

5.1 REPORTS

The NEBB Procedural Standards for Fume Hood Performance Testing establishes minimumrequirements of a NEBB Certified FHT Report. The standards have been developed and writtenusing Shall, Should, and May language. It is important to note these particular words throughoutthis document and how they pertain to NEBB Procedural Standards.

NEBB does not require the use of NEBB produced forms. Customized forms are acceptablebased on the data acquisition requirements of this section. Where contract document data reportingrequirements exceed the minimum requirements of NEBB, the NEBB Certified FHT Firm isresponsible to meet the requirements of the contract documents. NEBB has created sample FHT

reporting forms that are available to be downloaded from the NEBB website at www.nebb.org.

NEBB Fume Hood Performance Testing Reports shall include the following information:

A. REPORT TITLE

B. REPORT CERTIFICATION

C. TABLE OF CONTENTS

D. REPORT SUMMARY / REMARKS

E. APPROPRIATE FORMS

F. INSTRUMENT CALIBRATION

G. ABBREVIATIONS

5.2 REQUIRED DATA

Listed below are the requirements for each NEBB Certified FHT Report in Shall, Should, and Maylanguage.

5.2.1 REPORT TITLE

Shall Data: The heading: Certified Fume Hood Performance Testing Report; Project Name,Address, NEBB Certified FHT Firm Name, Address, Contact Information and Certification Number.

May Data: Architect Name, Address and Contact Information; Engineer Name, Address, and ContactInformation; HVAC Contractor Name, Address and Contact Information.


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5.2.2 REPORT CERTIFICATIONThe certification page SHALL bear the stamp of the NEBB Certified FHT Professional. The stamp onthe certification page SHALL be signed as evidence that the NEBB Certified Professional hasreviewed and accepted the report. Signature stamps are specifically prohibited.

Shall Data: Project Name; Certifying NEBB Certified FHT Professionals Name; Firm Name;Certification Number; Expiration Date; Certifying NEBB Certified FHT Professionals NEBB Stamp(signed & dated); and either of the following exact certification verbiage.

Where fume hood performance testing was performed in complete accordance with the requirementsof this Procedural Standard, the following exact verbiage shall be used on the Report Certificationpage:

"THE DATA PRESENTED IN THIS REPORT IS A RECORD OF THE FUME HOOD PERFORMANCETESTING OBTAINED IN ACCORDANCE WITH THE REQUIREMENTS OF THE CURRENTEDITION OF THE NEBB PROCEDURAL STANDARDS FOR FUME HOOD PERFORMANCETESTING. ANY VARIANCES FROM DESIGN / OR INDUSTRY STANDARDS WHICH EXCEED THELIMITS SET BY THE CONTRACT DOCUMENTS, OR WHICH EXCEED THE LIMITS AGREED TOBETWEEN THE OWNER AND THE NEBB CERTIFIED FHT FIRM ARE NOTED THROUGHOUTTHIS REPORT AND / OR IN THE REPORT PROJECT SUMMARY."

NEBB recommends that fume hood testing should be performed in accordance with the requirementsof these Procedural Standards and that all three of the primary tests (Airflow Velocity Tests, AirflowVisualizations Tests, and Tracer Gas Containment Tests) are performed. There may be cases wherethe scope of the work requires testing to other industry standards, or requires testing to a scope ofwork that is specified or as agreed to between the owner / buyer and the NEBB Certified FHT Firm.Under these conditions, a NEBB Certified FHT Firm may still issues a NEBB Certified FHT Report, butthe procedural variances SHALL be clearly delineated in the project scope of work and the aboveCertification Statement SHALL be modified to reflect the actual scope of work or other industry testingstandards to qualify as a NEBB Certified Report. See Section 2.3.1.

Should Data: Disclaimer statement with the following suggested wording:

The results shown and information given in this report are certified to be accurate and complete to theextent possible by equipment and procedures used on this date.

___(Insert Company Name)_____________________________________ warrants that the equipmentor system listed above and/or identified in this report is operating at the specified levels as shown, at andonly at this time, and makes no other warranties, stated or implied, concerning the continuedperformance, operation or safety in use of this equipment past this time.

Note: The Certification Statement and the Disclaimer Statement may be included on the report titlepage or on a separate certification page.

5.2.3 TABLE OF CONTENTSThe table of contents shall serve as a guide to the organization of the FHT report.

Shall Data: Page numbers of system and component information in the report.


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5.2.4 REPORT SUMMARY / REMARKSA NEBB Certified FHT Report includes a narrative description of test methods and system set-upconditions established prior to testing. The narrative should explain the rational for systemparameters, such as the Test Setup Mode, and the steps taken to achieve the desired set-up.

This section also includes a listing of deficiencies in the summary and identifies the appropriate pagesin the report. Deficiencies or other issues that are critical in nature relative to occupant health orfacility safety shall be red tagged and brought to the immediate attention of the AHJ. The NEBBCertified FHT Firm SHALL NOTwait to identify these issues on a final FHT Report.

Shall Data: Summary of all items that exceed Contract Document tolerances or any other items thatrequire discussion / explanation.

5.2.5 ALL REPORT PAGESAll tested items included in the NEBB FHT Report shall be clearly identified with its associated fumehood designation number or other unique descriptor.

The location of each tested item shall also be identified on each report page. The location identifiershould be the room number, the space number or other unique descriptor to clearly identify the testeditem.

The method of identification shall use schematic diagrams, mechanical plans where permissible, or anarrative description. Each data form supplied in a NEBB FHT Report shall include the name of theresponsible technician / NEBB Certified FHT Professional who reported the information, and the timeperiod the data was collected.

Shall Data: Project name. All pages shall be numbered consecutively.

May Data: Remarks section to record any information pertinent to the data reported on the datasheet.

5.2.6 INSTRUMENT CALIBRATIONThis is an overall listing of the instruments that will be used to verify the reported data.

Shall Data:Instrument typeInstrument manufacturerInstrument model numberInstrument serial numberDate of instrument calibrationTracer Gas purity certification

5.2.7 ABBREVIATIONSThis is a list of definitions of the relevant abbreviations used in the report.

Shall Data: A listing of all abbreviations and their definition as used in the report.


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5.2.8 AIRFLOW VELOCITY TEST REPORT DATA CONSTANT AIR VOLUME SYSTEMSAirflow velocity tests shall be presented in graphical or tabular format for each measurement planeand location and the data shall be reported on the test reporting form(s).

Shall Data:

Technician NameDate of TestTest Setup ModeSash ConfigurationDesign Opening Sash Position (Height and

Width)Design Airflow Face Velocity (fpm) (m/s)

Average Airflow Face Velocity at each gridlocation (fpm) (m/s)Average Airflow Face Velocity (fpm) (m/s)Highest Airflow Face Velocity (fpm) (m/s)Lowest Airflow Face Velocity (fpm) (m/s)Test InstrumentationAcceptance Criteria

Should Data:Sash Openings other than Design Conditions and associated resultsTemperature (F) (C)

Altitude and Correction FactorRoom Layout Drawing

5.2.9 AIRFLOW VELOCITY TEST REPORT DATA VAV SYSTEMSAirflow velocity tests shall be presented in graphical or tabular format for each measurement planeand location and the data shall be reported on the test reporting form(s).

Shall Data:Technician NameDate of TestTest Setup Mode

Sash ConfigurationDesign Opening Sash Position (Height andWidth)

Design Airflow Face Velocity (fpm) (m/s)Average Airflow Face Velocity at each grid

location (fpm) (m/s)Average Face Velocity (fpm) (m/s)Highest Airflow Face Velocity (fpm) (m/s)Lowest Airflow Face Velocity (fpm) (m/s)Test Instrumentation

Test results reported at 25%, 50% and100% of specified conditions

Speed of Response (in seconds) (3 cycles)

Low Value of Range (in percentage)High Value of Range (in percentage)Relative Range (in percentage)Repeatability (in percentage)Time to Steady State (in seconds) (3 cycles)Test Method (exhaust airflow velocity

method or fume hood plenum airflowvelocity method)

Acceptance Criteria

Should Data:Sash Openings other than Design Conditions and associated resultsTemperature (F) (C)Altitude and Correction FactorRoom Layout Drawing


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5.2.10 AIRFLOW VISUALIZATION TEST REPORT DATA LOCAL CHALLENGE

Shall Data:Technician NameDate of Test

Test Setup ModeSash ConfigurationSash Opening Height and Width

Challenge Medium UsedNarrative description of actual visual test

results including Statement of Pass/FailTest InstrumentationAcceptance Criteria

Should Data:Room Layout Drawing

May Data:Video tape of actual test

5.2.11 AIRFLOW VISUALIZATION TEST REPORT DATA LARGE VOLUME CHALLENGE

Shall Data:Technician NameDate of TestTest Setup ModeSash ConfigurationSash Opening Height and Width

Challenge Medium UsedNarrative description of actual visual test

results including Statement of Pass/FailTest InstrumentationAcceptance Criteria

Should Data:Room Layout Drawing


5.2.12 TRACER GAS CONTAINMENT TEST REPORT DATA STATIC MODE

Shall Data:Technician NameDate of testTime of testTest Setup ModeSash Configuration

Sash Opening Height and WidthRoom Layout DrawingGraphical display of each test

Tracer Gas Release RateTest InstrumentationReport all individual readings, the average

and peak at each sample locationReport the Performance Rating and compare

to the Acceptance Rating. Tests resultsthat exceed acceptance ratings shall benoted in the report.



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5.2.13 TRACER GAS CONTAINMENT TEST REPORT DATA SASH MOVEMENT EFFECT

Shall Data:Technician NameDate of test

Time of testTest Setup ModeSash ConfigurationSash Opening Height and WidthRoom Layout DrawingGraphical display of each testTracer Gas Release RateTest Instrumentation

Report all individual readingsReport the maximum 45 second rolling

average associated with each opening ofthe sashReport the Sash Movement Performance

Effect RatingIf Acceptance Rating has been defined,

test results that exceed acceptancerating shall be noted in the report


5.2.14 TRACER GAS CONTAINMENT TEST REPORT DATA PERIMETER SCAN

Shall Data:Technician NameDate of testTime of testTest Setup ModeSash ConfigurationSash Opening Height and WidthRoom Layout DrawingFume Hood Face Schematic

Report any measurable leakageReport the location and magnitude of the

leakageTracer Gas Release RateTest InstrumentationIf Acceptance Ratings have been defined,

tests results that exceed acceptanceratings shall be noted in the report


5.2.15 OTHER FUME HOOD PERFORMANCE TEST REPORT DATA

Shall Data:As agreed to between the Owner and the NEBB Certified FHT Firm


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PART 2 - PROCEDURESSECTION 6 LABORATORY ANDCLEANROOM SAFETY

6.1 INTRODUCTION

A health and safety program is a definite plan of action designed to prevent accidents andoccupational diseases. A health and safety program should include the elements required by allcurrent health and safety legislation as a minimum. This document summarizes the general elementsof a health and safety program. This should help NEBB firms to develop programs to deal with theirspecific needs. Because many small and medium-sized enterprises lack the resources of larger

organizations, it is even more vital that small and medium-sized enterprises involve all employees inhealth and safety activities. The more comprehensive the program is, the more employeeinvolvement can be expected.

The health and safety program discussed in this section is a guideline. The project specific safetyprogram shall be as specified in the contract documents or as agreed to between the Owner/Buyer andthe NEBB Certified FHT Firm.

Most often the NEBB Certified FHT firm will be required to follow the clients project specific safetyprogram; however in the absence of this project specific safety program, the firms StandardOperating Procedures (SOP) for a health and safety program SHALL be followed. For this reason,the NEBB Certified FHT Firm SHALL be responsible for creating their own SOP for Safety and

develop it into a Standard Operating Procedure (SOP) for their firm. At a minimum, the NEBBCertified FHT Firms SOP for Laboratory and Cleanroom Safety SHOULD cover design andimplementation, responsibilities and elements of the plan as addressed below.

6.2 DESIGNING A HEALTH AND SAFETY PROGRAM

6.2.1 DESIGNING A PROGRAM POLICY

A NEBB Certified FHT Firms health and safety policy is a statement of principles and general rulesthat serve as guideslines for action.

6.2.1.1 The policy SHOULDmention:

a. Management's commitment to protect the safety and health of employeesb. The objectives of the programc. The organization's basic health and safety philosophyd. Who is accountable for health and safety programse. The general responsibilities of all employeesf. That health and safety shall not be sacrificed for expediencyg. That unacceptable performance of health and safety conduct will not be tolerated


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6.2.1.2 The policy SHOULDbe:

a. Stated in clear, unambiguous, and unequivocal termsb. Signed by the incumbent chief executive officerc. Kept up-to-date

d. Communicated to each employeee. Adhered to in all work activities

6.2.2 DESIGNING A TRAINING PROGRAM

The objective of training is to make the implementation of health and safety policies into specific jobpractices and accepted practice. It also raises awareness and skill levels of a technician to anacceptable standard.

6.2.2.1 Occasions when employee training SHOULDbe required are:

a. Commencement of employmentb. Reassignment or transfer to a new job

c. Introduction of new equipment, processes, or proceduresd. Inadequate performancee. Customer and job site related chemical or biological hazards, equipment, processes, or

procedures.

6.2.2.2 The NEBB Certified FHT Firm SHOULD have the following topics included in the safetytraining:

a. Safety and the supervisorb. Know your accident problemsc. Human relationsd. Maintaining interest in safety

e. Instructing for safetyf. Industrial hygieneg. Personal protective equipmenth. Industrial housekeepingi. Material handling and storage

j. Guarding machines and mechanismsk. Hand and portable power toolsl. Fire protection

6.2.3 ESSENTIALS OF THE HEALTH AND SAFETY PROGRAM

While different NEBB Certified FHT Firms will have different needs and requirements in their healthand safety program, the following basic items MAYbe considered in each case:

a. Individual responsibilityb. Occupational health and / or safety representativec. Health and safety rulesd. Correct work procedurese. Employee orientationf. Trainingg. Workplace inspectionsh. Reporting and investigating accidents


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i. Emergency procedures j. Medical and first aidk. Health and safety incentivesl. Workplace specific items

6.3 RESPONSIBILITIES

6.3.1 INDIVIDUAL HEALTH & SAFETY RESPONSIBILITIES

Health and safety is the joint responsibility of both management and technicians. All health and safetyactivities are based on specific individual responsibilities. Responsibility may be defined as anindividual's obligation to carry out assigned duties. Authority implies the right to make decisions andthe power to direct others. The NEBB Certified FHT Firm MAY elect to have its Safety Officermanage the responsibilities in lieu of the NEBB Certified FHT Professional.

6.3.1.1 NEBB Certified Professionals / Safety Officer ResponsibilitiesTo fulfill their responsibilities, the NEBB Certified FHT Professional / Safety Officer SHOULD:

a. Instruct workers to follow safe work practices

b. Enforce health and safety regulationsc. Correct unsafe acts and unsafe conditionsd. Ensure that only authorized, adequately trained workers operate equipmente. Report and investigating all accidents/incidentsf. Inspect own area and taking remedial action to minimize or eliminate hazardsg. Ensure equipment is properly maintainedh. Update and maintain company material safety data sheets (MSDS)i. Promote safety awareness in workers

j. Provide a safe and healthful workplacek. Establish and maintaining a health and safety programl. Ensure workers are trained or certified, as requiredm. Report accidents and cases of occupational disease to the appropriate authorityn. Ensure access to medical and first aid facilities are availableo. Ensure personal protective equipment is availablep. Provide workers with health and safety informationq. Evaluate health and safety performance of techniciansr. Advise all employees on health and safety matterss. Coordinate interdepartmental health and safety activitiest. Provide health and safety trainingu. Conduct research on special problemsv. Attend health and safety committee meetings as a resource person

6.3.1.2Field Technician ResponsibilitiesTo fulfill their responsibilities, the field technicians SHOULD:

a. Use personal protection and safety equipment as required by the client project specific safetyprogram or the NEBB firms SOP

b. Follow safe work proceduresc. Possess company material safety data sheets (MSDS)d. Know and comply with all regulationse. Report any injury or illness immediatelyf. Report unsafe acts and unsafe conditionsg. Participate in joint health and safety committeesh. Know what their responsibilities are (communication required)


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i. Have sufficient authority to carry them out (organizational issue)j. Have the required ability and competence (training or certification required)

6.4 ELEMENTS OF THE PROGRAM

The NEBB Certified FHT Professional / Safety Officer SHOULDaddress the following elements of the

firms health and safety program:

a. Establish work proceduresb. Analyze project hazardsc. Establish guideline rulesd. Conduct employee safety orientatione. Establish emergency proceduresf. Establish medical and first aid action plang. Perform routine project site safety auditsh. Complete project accident / injury reportsi. Investigate project accidents/ injuries

j. Establish and enforce return-to-work policy

k. Promote employee involvement in health and safety programs

6.4.1 PROJECT SPECIFIC ITEMS

Examples of project specific items that SHOULDbe included in health and safety programs are:

a. Material Safety Data Sheets (MSDS)b. Lock out proceduresc. Chemical handling rulesd. Biological material handling rulese. Personal hygienef. Vehicle safety rulesg. Working alone guidelinesh. Personal protective equipment requirements

6.4.2 HEALTH AND SAFETY PROGRAM IMPLEMENTATION

A good health and safety program provides a clear set of guidelines for activities that, if followed, willreduce accidents and cases of occupational disease. A NEBB Certified FHT Professional SHOULDdemonstrate commitment and support the program by:

a. Providing resources such as time, money, and personnelb. Ensuring that employees receive training or certification as requiredc. Making all applicable health and safety information available to all employees entitled to

receive itd. Including health and safety performance as part of employee performances appraisals at all

levels

e. Attending health and safety meetingsf. The program must be communicated to all employeesg. Special emphasis should be given to new workers, newly appointed NEBB Certified

Professionalsh. Revisions to policies and procedures should be publicizedi. The program should be available in a single written document (However, if separate manuals

have been developed for various elements, such as accident investigation procedures, theiruse should be referred to in the main document)


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SECTION 7 LABORATORY AND

CLEANROOM PROTOCOL

7.1 INTRODUCTION

The purpose of this Section is to provide an overview of the protocol procedures that should beobserved in performing the various tests in cleanrooms and laboratories. In general, there areprotocols and procedures for entry, garment control, tool and equipment entry and gowning procedures.In addition to entry protocols, there are also protocols and behavior requirements while in the laboratory/cleanroom spaces. The protocols suggested in this section are guidelines and the final proceduresshall be as specified in the contract documents or as agreed to between the Owner/Buyer and theNEBB Certified FHT firm.

Most often the NEBB Certified FHT firm will be required to follow the client project specific protocol;however, in the absence of this project specific protocol, the firms SOP for laboratory and cleanroomprotocol shall be followed. For this reason, the NEBB Certified FHT Firm shall be responsible forcreating their own SOP for protocol and develop it into a Standard Operating Procedure (SOP) fortheir firm. At a minimum, the NEBB Certified FHT Firms SOP for Laboratory and Cleanroom Protocolshould cover: gowning procedures, equipment entrance procedures, and guidelines for employeeconduct.

7.2 LABORATORY AND CLEANROOM PROCEDURES

7.2.1 GOWNING PROCEDURES

The processes and operations that occur in laboratory/cleanroom are unique to that particular owner

and facility. Therefore the gowning procedures may vary to some degree between each cleanroom andeach owner. It is imperative that the facilitys/owners SOP be reviewed for the specific gowningprocedure. When it exists, this SOP always takes precedence and shall be followed.

In many cleanroom gowning facilities there are two distinct zones in the gowning area. In somefacilities, the two distinct zones may exist in the same room/space defined by some imaginary boundary.The initial area will have gloves, hair bonnets and shoe covers. Since the outside surface of thecleanroom garments should be kept as clean as possible, care should be used to avoid touching theoutside of the garment with bare hands, hair and street shoes. This is accomplished by donning gloves,bouffant head covers and shoe covers before entering the second phase of the gowning area.

It is important to note that laboratories/cleanrooms in the electronics industry may be quite different from

laboratories/cleanrooms in the pharmaceutical and bio-technology industries. While gowning remainsimportant, a high emphasis is placed on sterility. Cleaning/washing procedures can be much morerigorous. In some instances, usually associated with bio-containment spaces (i.e. BSL3 and BSL4labs), street clothes will not be allowed into the room and a complete change of clothing is required.

Upon entering the second area it is important to note that different gowning garments will be used indifferent facilities. Since gowning materials differ, there is no hard and fast method that can be outlinedfor actual gowning, but typically gowning should be done from the head down. Therefore the hood willbe donned first, and then the garment, then the foot covers. Once the garment is obtained, care should


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be taken to avoid contaminating the exterior surface with the interior of the garment. Proper garmentsizing is also required. Once obtained, the garment user should never allow the garment to touch ordrag on the floor.

7.2.2 EQUIPMENT ENTRANCE PROCEDURES

Tools, instrumentation and equipment also require special preparation before they can be brought into alaboratory/cleanroom. As with gowning, each facility will have their own methods and requirements forintroducing these items into a cleanroom. It is imperative that the facility/owners SOP be reviewed formaterial ingress to their cleanroom. When it exists, this SOP always takes precedence and must befollowed.

Typically there will be a wipe down station for anything entering the cleanroom. There will also be awipe down procedure. Often the procedure will involve wipe down with non-contaminating wipesmoistened with de-ionized water and isopropyl alcohol (IPA) or other sterile solvents. The ingress forequipment may be a separate entrance from the gowning entrance.

7.2.3 LABORATORY/CLEANROOM CONDUCT

Examples of personnel rules used by laboratory/cleanroom operators may be:

a. Clean hands and face before entering clean areasb. Use lotions and soap containing lanolin to reduce skin flakingc. Avoid skin contacts with solventsd. Wearing cosmetics and skin medications may not be permittede. Jewelry may not be permittedf. Smoking, eating and drinking is not permittedg. Required gowning, masks, gloves and shoe covers to be worn at all timesh. Use proper eye protectioni. Equipment, instruments and materials should be cleaned before entry

j. Non-shedding paper and pens should be used. Pencils and erasers are not permittedk. Work parts are to be handled only with gloved hands, tweezers, or other methods to avoid

transfer of skin particles and oilsl. Use containers to transfer and/or store materials


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SECTION 8 OVERVIEW OFTESTING REQUIREMENTS8.1 INTRODUCTION

The purpose of this section is to provide an overview of the various tests associated with fume hoodperformance testing in accordance with the American Society of Heating Refrigerating and AirConditioning Engineers (ASHRAE) Standard 110, Method of Testing Performance of Laboratory FumeHoods, and the American National Standards Institute (ANSI) Standard Z9.5, Laboratory Ventilation. Anoverview CANNOT provide all of the exacting requirements of these standards. For this reason, theNEBB Certified FHT Firm SHALL possess copies of the current versions of both of these industrystandards in addition to the NEBB Procedural Standard. Another excellent reference material is theASHRAE Handbook chapter on laboratory spaces. See Appendix D for additional references.

The methods and procedures to perform these tests and the results of the tests are a function of the hoodtypes, fume hood sash configuration styles and test setup modes. Thus a brief overview of theseparameters is also included in this section.

8.2 TEST SETUP PROCEDURES

8.2.1 FUME HOOD TYPESFume hoods are manufactured in two basic styles: bench type and walk-in. While most fume hoodsare bench type hoods, walk-in hoods are still required where the physical size of the test apparatuscannot be contained in a bench style enclosure.

Listed below are the most common types of fume hoods and their applications:

Standard: Airflow volume is relatively constant and airflow face velocity varies as a function of sashopening. May be furnished with all sash configurations. Common hood type found for almost allcontainment applications.

Bypass: Airflow volume and airflow face velocity are relatively constant for all sash openings. Asopening size changes due to changes in sash position, openings at the top and the bottom of thehood allow the balance of the air to be drawn into the hood while the airflow face velocity remainsconstant. May be furnished with all sash configurations. Common hood type found in mostcontainment applications.

Auxiliary Air: Airflow volume and airflow face velocity are relatively constant. A plenum is located

above the face of the hood and a connection is provided to receive air from a secondary source otherthan environmentally controlled room air. This secondary source can be conditioned or unconditionedair. These hoods are utilized to achieve energy savings.

Variable Air Volume: The airflow volume is a function of sash position. May be furnished with all sashconfigurations. Common hood type found for almost all containment applications.

While the above identify the most common fume hood types, fume hoods types also include: process,


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high-performance, radioisotope, perchloric acid, California, and distillation hoods. All of these fumehood types are simply variations of the four common types previously identified with somemodifications. A process hood is basically a standard hood without a sash. ASHRAE also identifies acanopy hood as a type of fume hood. This is really a misnomer as a canopy hood is related to akitchen style grease hood. Like a kitchen hood, the purpose of a canopy hood is to remove heat notfumes. Again, consult the ASHRAE Handbooks or various manufacturers details and submittalsdata.

8.2.2 FUME HOOD SASH CONFIGURATIONSFume hood sashes are normally made from safety glass. The purpose of the fume hood sash is two-fold: observation and protection. Sash configurations are sometimes identified as sash opening typesor sash styles. The wording sash configuration is the most appropriate. Fume hoods can bemanufactured in three various sash configurations: horizontal, vertical, and combination. The numberof sashes can vary and all sashes may not be operable.

Horizontal Sash: In these fume hoods the sash movement is horizontal. The arrangement can be

where one or more of the sashes can be opened at any one time and the sashes can be located atany position in the horizontal tracks.

Vertical Sash. In these fume hoods the sash movement is vertical. In a vertical sash configuration,there may be one or more sashes and they can be moved completely down for full closed tocompletely up to full open or any position in between.

Combination Sash. As the name implies, the sashes are a combination of vertical and horizontalsashes that serve the fume hood.

8.2.3 TEST SETUP (TEST SETUP MODE)Test Setup is sometimes identified as the Test Setup Mode. Test Setup is defined as the condition

that the fume hood will be during the actual test. There are three test setups: As-Manufactured (AM),As-Installed (AI), and As-Used (AU). It is important to note the differences between the three testsetups because the various test procedures, reporting and results are unique for each test setup.

As-Manufactured (AM): With this test setup, the fume hood is tested at the manufacturers facility orunder conditions that would replicate those conditions. The hood and work surface shall be void of allprocess equipment, apparatus and chemicals.

As-Installed (AI): With this test setup, the actual fume hood is tested in its installed, operatingcondition. All supply, exhaust and return air systems are installed, operable and under control. Thehood and work surface shall be void of all process equipment, apparatus and chemicals.

As-Used (AU): This test setup is the same as the As-Installed setup except the hood is being utilizedfor actual process work. Experiment equipment, chemicals and processes are being carried outinside the hood while the fume hood performance testing is being performed. This means that allnormal operating equipment within the hood shall be activated and operational including items suchas all heat and vapor producing appliances, physical obstructions, etc.


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When doing fume hood performance testing in accordance with the NEBB Procedural Standards forFume Hood Performance Testing, the test setup shall be defined prior to testing. Test setup shall be asspecified in the contract documents or as agreed to between the Owner/Buyer and the NEBB CertifiedFHT Firm.

8.3 ASHRAE STANDARD 110

The Forward of the current ASHRAE 110 Standard states that: The performance of a laboratoryhood in providing protection for the worker at the face of the hood is strongly influenced by theaerodynamic design of the hood, the method of operation of the hood, the stability of the exhaustventilation system, the supply ventilation of the laboratory room, the work practices of the user, and byother features of the laboratory in which it is installed. Therefore, there is a need for a performancetest that can be used to evaluate the performance of a laboratory hood in the ideal environment and inthe field to establish an "as used" performance rating, including the influences of the laboratoryarrangement and its ventilation system.

This standard defines a reproducible method of testing laboratory hoods. It does not define safeprocedures. However, laboratory hoods are considered by many to be the primary safety devices inconducting laboratory operations.

There are many important factors in the safe operation of laboratory hoods that are not described inthis standard.

There are several things about the ASHRAE standard that should be discussed. ASHRAE 110 DOESdefine a reproduci

Documents

Fume Hood Performance 2