111109 air admittance valves

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Air Admittance Valves

AIR ADMITTANCE VALVES

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What is an Air Admittance Valve (AAV)?AAV HistoryAAV BenefitsUnderstanding AAVsCode ApprovalsSpec Sheet Example

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Air admittance valves (AAVs) are pressure-activated, one-way mechanical vents, used in a plumbing system to eliminate the need for conventional pipe venting and roof penetrations. A discharge of wastewater causes the AAV to open, releasing the vacuum and allowing air to enter the plumbing vent pipe for proper escape of sewer gas and maintaining the trap seal.AAVs are typically made from polyvinyl chloride (PVC) plastic materials with ethylene propylene diene monomer (EPDM) rubber valve diaphragms. Valves come in two sizes: one for fixture venting and a larger size for system venting. The valves fit standard diameter pipes ranging from 1-1/4 to 4 inches.

What is an Air Admittance Valve (AAV)?

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Sture Ericson developed the air admittance valve in Sweden in the early 1970s. He introduced the valve to the United States in 1986 and was instrumental in the development of the ASSE Performance Standards 1050 and 1051, as well as gaining code approvals in state and model codes.In 1988, Studor, Inc. was established as the distributor for North America. Studor, Inc. was acquired by IPS Corporation in 1998.

AAV History

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Reduces roof penetrationReduces vent pipe roof flashings that eventually leakReduces unsightly vent pipesPrevents vermin and pests from entering the building through open vent pipesReduces pollution of the environment by sewer gas, and prevents sewer gases from being drawn into air conditioning units and air handlers and polluting habitable spacesProvides architects and engineers freedom of layout and designReduces the number of fire stopping devicesSolves problem to vent island sinks, wet bars and other fixtures in difficult locations

AAV Benefits

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Air admittance valves must be installed in accordance with the requirements of the IPC where this code is in effect and with the installation standards of the specific manufacturer. The requirements of the major manufacturers are very similar to the requirements of the IPC. Following are general requirements for installing an air admittance valve:

1. Individual or branch-type air admittance valves may be used for venting individual fixtures, branch fixtures, and circuited fixtures. By this requirement, air admittance valves are not permitted for venting combination drain and vent systems and wet-vented systems. Air admittance valves are not permitted to vent these systems because of the possibility of positive pressure in combination drain and vent systems and wet-vented systems.

Understanding AAVs

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2. Stack vents and vent stacks shall be permitted to terminate to stack-type air admittance valves.

3. Individual and branch-type air admittance valves shall only vent fixtures that are on the same floor level. These fixtures shall connect to a horizontal branch drain.

4. Air admittance valves shall only vent stacks and systems that are a maximum of four branch intervals from the top of the stack.

5. Drainage systems and stacks that are four branch intervals from the top of the stack shall be provided with a relief vent. This relief vent shall extend to the venting system that extends to the outdoors.

6. Stack-type air admittance valves shall not serve as the vent terminal for drainage systems that exceed six branch intervals.

7. Individual and branch-type air admittance valves shall be located a minimum of 4 inches above the fixture drain.

Understanding AAVs

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8. Stack-type air admittance valves shall be located at least 6 inches above the flood level rim of the highest fixture drain.

9. The valve shall be located within a ventilated space.10. A minimum of one vent shall extend to the outdoors.

Understanding AAVs

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Code Approvals

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State IPC IRC UPC NSPCApproval

StatusAlabama X X Approved

Alaska X Not Approved

Arizona X X Approved

Arkansas X Approved

California X Partial Approval

Colorado X X Approved

Connecticut X Approved

Delaware X X Approved

District of Columbia X X Approved

Florida X Approved

Georgia X X Approved

Hawaii X Approved

Idaho X X Approved

Illinois Not Approved

Indiana X X Approved

Iowa X Not Approved

Kansas X X Partial Approval

Kentucky Not Approved

Louisiana Not Approved

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Code Approvals

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State IPC IRC UPC NSPC Approval Status

Maine X X Not Approved

Maryland XApproved Appendix E 2005 edition

Massachusetts Not Approved

Michigan X X Approved

Minnesota Not Approved

Mississippi X X Approved

Missouri X Partial Approval

Montana X Not Approved

Nebraska X X Not Approved

Nevada X Partial Approval

New Hampshire X Approved

New Jersey XApproved Appendix E 2005 edition

New Mexico X Partial Approval

New York X X Approved except NYC

North Carolina X X Approved

North Dakota X Not Approved

Ohio X Approved

Oklahoma X Approved

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Code Approvals

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State IPC IRC UPC NSPC Approval Status

Oregon X Approved

Pennsylvania X X Approved except Philadelphia

Rhode Island X X Approved

South Carolina X X Approved

South Dakota X Partial Approval

Tennessee X Approved except Shelby County

Texas X X X Approved (limited Houston approval)

Utah X X Approved

Vermont X Approved

Virginia X X Approved

Washington X Partial Approval

West Virginia X X Approved

Wisconsin X Approved

Wyoming X X Not Approved

Approval status as of December 31, 2010

IPC=Internatinal Plumbing Code

IRC=International Residential Code

UPC=Uniform Plumbing Code

NSPC=National Standard Plumbing Code

Note: Plumbing Codes are subject to change, please verify with your local code officials before installing AAVs

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Spec Sheet Example

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111109 air admittance valves