Bathroom Fan Venting Into Attic

It cannot move air to a crawlspace or attic.

Bathroom fan venting into attic.

In order to accomplish this the roof has to have a hole cut in it. There are several other factors to consider for proper ventilation such as. 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.

Example model ventilation codes. Depending on the location of the bathroom it may be easy to vent the exhaust fan through the roof. While this may seem obvious homeowners may out of convenience direct the vent into either of these locations. Exhaust air from toilet rooms and bathrooms shall not discharge into attic crawl space or other areas inside building.

It seems like such an easy solution just leave a bathroom vent hose in an attic. This involves running ductwork from the fan usually though an attic and out through the roof. This section notes that air exhausted from the bathroom must be sent outdoors not indoors to the same residence or indoors to any other dwelling unit. Through the roof or an exterior gable wall.

Each bathroom has its own exhaust fan. Each fan vents separately out the roof. One in line centrifugal fan can be mounted in the attic to exhaust the moisture from two bathrooms. Bathroom fan vent code requirements include no venting to attic areas to help reduce mold or structural problems.

See bathroom vent duct termination for details about how to terminate the bath exhaust vent duct. Although this isn t always possible in attic crawl spaces you should always insulate the duct to prevent condensation problems. Duct already wrapped in insulation at home centers. Both bathrooms are vented by a single in line fan that has one exhaust vent running through the roof.

Exhausting of the bath vent fan must indeed be to the building exterior. You can find 4 in. No you should not vent a bathroom fan directly into 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.

The best exhaust fan venting is through smooth rigid ducts with taped joints and screwed to a special vent hood.