Bath Fan Vents Into Attic

Second during cold winters you ll be blowing warm moist air onto a cold surface the roof vent and roof plywood. When venting a bathroom exhaust fan make sure to vent the air to the outside rather than into your attic where it can cause mold and mildew to form. If you re tempted to vent your exhaust fan through an existing roof vent or even vent it into the attic don t do it.

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Through the roof or an exterior gable wall.

Bath fan vents into attic.

No you cannot vent your bathroom exhaust fan into the attic. Options for venting a bathroom exhaust fan include best to worst. First you ll partially block your roof vent with the piping reducing the flow of cooling air through your attic. It seems like such an easy solution just leave a bathroom vent hose in an attic.

No you should not vent a bathroom fan directly into an attic. Do not simply terminate a bath vent fan duct in an attic as shown in our photo above nor can you just dump the exhaust vent into a crawl space nor into a closed wall floor or ceiling cavity. Otherwise you re inviting a moisture mold rot insect problem in the building. Your attic is not a temperature controlled environment is never the same temperature as your living space and generally closer to the temperature outside.

However you can vent a bathroom fan through an attic while it terminates on the roof or gable end. Bathroom ventilation codes require a bathroom exhaust fan to vent to the exterior not the attic for health and structural reasons. The exhaust vent must terminate outdoors. It s all outdoor air anyways right.

Bathroom fan vent code requirements include no venting to attic areas to help reduce mold or structural problems. You should never exhaust the bathroom fan directly into the attic.

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