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Moisture control

Bathroom Ventilation

A bathroom fan is part of the room's moisture-management strategy. Good ventilation depends on the whole path from the room to the exhaust termination.

Home / Bathroom Ventilation: Fans, Moisture and Airflow

Think beyond the fan grille

Fan performance can be affected by duct length, turns, restrictions and termination. A high-rated fan does not guarantee good airflow if the duct path is poor.

Put controls where they will be used

Timers, humidity-sensing controls or other strategies may help the fan run long enough after bathing. The best control is one household members will actually use.

Coordinate with the remodel

A renovation is a good time to inspect existing ventilation and decide whether the fan, duct route or termination needs attention before ceilings and walls are closed.

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Related bathroom remodeling guides

General information only. Project-specific permit, code, licensing, safety, accessibility and technical requirements should be confirmed with qualified professionals and the applicable authority.

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