Bathroom Fan Vent Through Attic

Options for venting a bathroom exhaust fan include best to worst.

Bathroom fan vent through attic. Surprisingly bathroom fans are not required by some building codes. Depending on the location of the bathroom it may be easy to vent the exhaust fan through the roof. Through the roof or an exterior gable wall. Both bathrooms are vented by a single in line fan that has one exhaust vent running through the roof.

Although this isn t always possible in attic crawl spaces you should always insulate the duct to prevent condensation problems. Improperly ending a bathroom vent inside an attic can lead to unintended consequences and builders have stopped this bad practice many years ago. You can find 4 in. Duct already wrapped in insulation at home centers.

The best exhaust fan venting is through smooth rigid ducts with taped joints and screwed to a special vent hood. Let me tell you. No you should not vent a bathroom fan directly into an attic. In order to accomplish this the roof has to have a hole cut in it.

In all cases the ducting needs to conduct the exhaust to the building exterior and needs to terminate in an animal proof vent cover. Each fan vents separately out the roof. Bath vent fan duct routing. It seems like such an easy solution just leave a bathroom vent hose in an attic.

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. This involves running ductwork from the fan usually though an attic and out through the roof. You should never exhaust the bathroom fan directly into the attic. Up through roof down through floor or crawl area.

Bathroom code does address the issue of moving odor and moisture laden air from the bathroom to the outside. However you can vent a bathroom fan through an attic while it terminates on the roof or gable end. One in line centrifugal fan can be mounted in the attic to exhaust the moisture from two bathrooms. All municipalities have different requirements but some do not draw a hard line on requiring exhaust fans.

This article describes routing bath exhaust fan duct upwards through an attic or roof space or downwards through a floor or crawl space. Your attic is not a temperature controlled environment is never the same temperature as your living space and generally closer to the temperature outside. No you cannot vent your bathroom exhaust fan into the attic. It is because of this that many builders tend to advise against this method.

Each bathroom has its own exhaust fan.