Bathroom Exhaust To Attic

No you cannot vent your bathroom exhaust fan into the attic.

Bathroom exhaust to attic. Wall mount fans are mounted on an external wall of a home and are used if there isn t a way to vent through the roof as in the case of a bathroom on the first floor of a home. No you should not vent a bathroom fan directly into an attic. If you re simply replacing the fan the ducts should already be set up for you. This is much easier to do if you have attic access because if you don t you usually have to remove some ceiling drywall and run the ducts along a joist.

Allowing the exhaust to vent into your attic can potentially cause several moisture problems. If you have access to the attic the fan can vent either through a gable wall or roof. Note that the bathroom vent fan must always exhaust to the outdoors. It s all outdoor air anyways right.

Bathroom fan sound levels. The warm air will exhaust out the duct and enter back into the attic through the soffit vent or ridge vent. However you can vent a bathroom fan through an attic while it terminates on the roof or gable end. There are wall mount exhaust fans as well as ceiling exhaust fans.

The building code requires a bathroom exhaust fan to vent outside the building so installation of a new bathroom fan necessarily involves installation of ductwork. You should never exhaust the bathroom fan directly into the attic. Ceiling fans vent either into the attic or outside through the roof. Venting through a roof vent or exhausting them in the attic could cause moisture problems and rot.

See bathroom vent duct termination for details about how to terminate the bath exhaust vent duct. It seems like such an easy solution just leave a bathroom vent hose in an attic. Vent your bath and kitchen exhaust fans through the roof through a special roof hood. Exhaust air from toilet rooms and bathrooms shall not discharge into attic crawl space or other areas inside building.

Example model ventilation codes. Never allow the duct to simply blow into an attic crawlspace or other enclosed area. Letting the fan exhaust into an open attic will cause moisture buildup on the underside of the roof. The exhaust needs to vent outdoors.

Venting a bathroom exhaust fan into your attic is never a good idea here are three better options.