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| | Air Admittance Valves |
 | | 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. |
 | | Although this method is simple and reliable, it requires each plumbing fixture to have a lateral return vent that passes through wall studs to a central stack, or to have its own vertical vent that passes through the wall, ceiling, attic, and roof. |
 | | Because air admittance valves eliminate the need for vent stack penetrations and flashing at wall assemblies, attics, and roof decks, they mitigate the potential for air and water leakage due to vent stack penetrations. |
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