U.S. Department of Energy - Energy Efficiency and Renewable Energy

Building Technologies Office – Energy Open House

Bathroom Fan Vent

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Bathroom exhaust should vent outside, not into the attic.
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Energy Facts: To avoid potentially serious problems with mold, bathroom fans must vent to the outdoors.

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Scout It Out: Turn on each bathroom fan one at a time and take a tour of the attic. Is the air being vented there?

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Tips: Call a home improvement contractor to help you reroute a bathroom vent to the outdoors.