InstallationQuestion 51 of 110
Return air for a gas furnace must not be taken from which location?
a.A hallway
b.A garage or other space where it could pick up combustion products or flammable vapors
c.A conditioned bedroom
d.A central living room
Explanation
Drawing return air from a garage, furnace room, or similar space risks pulling in carbon monoxide, fuel vapors, or other contaminants and distributing them through the home. The CMC prohibits return openings in these locations. Return air must come from conditioned, safe spaces.
Law Reference: 2022 California Mechanical Code (CMC)Practice all 110 questions free — no signup required.
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