Bathroom Exhaust Fan Venting In Attic

Bathroom ventilation codes require a bathroom exhaust fan to vent to the exterior not the attic for health and structural reasons.

Bathroom exhaust fan venting in attic.

Options for venting a bathroom exhaust fan include best to worst. It s all outdoor air anyways right. Your attic is not a temperature controlled environment is never the same temperature as your living space and generally closer to the temperature outside. It seems like such an easy solution just leave a bathroom vent hose in an attic.

However you can vent a bathroom fan through an attic while it terminates on the roof or gable end. You can find 4 in. You should never exhaust the bathroom fan directly into the attic. One attic mounted fan for two bathrooms one in line centrifugal fan can be mounted in the attic to exhaust the moisture from two bathrooms.

Let me tell you. Bathroom fan vent code requirements include no venting to attic areas to help reduce mold or structural problems. The best exhaust fan venting is through smooth rigid ducts with taped joints and screwed to a special vent hood. Duct already wrapped in insulation at home centers.

Improperly ending a bathroom vent inside an attic can lead to unintended consequences and builders have stopped this bad practice many years ago. No you cannot vent your bathroom exhaust fan into the attic. Although this isn t always possible in attic crawl spaces you should always insulate the duct to prevent condensation problems. If you have two bathrooms that are close together and one has an exhaust fan and the other doesn t you might be wondering if you can tie a new exhaust duct into the existing one.