Core TradesQuestion 40 of 700
The outlet of a bathroom or clothes-dryer environmental exhaust duct must terminate:
a.Inside the attic space above the insulation
b.Outdoors, and a minimum distance from openings into the building
c.Into the return-air plenum of the furnace
d.Inside a ventilated crawl space
Explanation
Environmental exhaust must discharge to the outdoors and be kept a minimum distance (commonly 3 feet) from doors, windows, and other openings so moist or lint-laden air is not drawn back in. Terminating in an attic, plenum, or crawl space is prohibited.
Law Reference: 2025 CA Mechanical Code (CMC) §504 (Environmental Exhaust)Practice all 700 questions free — no signup required.
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