Drainage, Waste & VentQuestion 125 of 360
Where are air admittance valves (AAVs) prohibited from being installed?
a.In a location where they could be exposed to a supply or return air plenum
b.In an accessible attic space
c.Within a wall cavity that has a ventilation grille
d.Under a lavatory in a vanity cabinet
Explanation
AAVs must not be installed in a supply or return air plenum, because a valve failure could draw sewer gas into the building's air distribution. They must be located in a ventilated, accessible space and installed above the fixtures they serve. Attics and vanity cabinets are commonly acceptable when accessible.
Law Reference: 2022 California Plumbing Code (CPC) §918.0Practice all 360 questions free — no signup required.
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