Bathroom Fan Venting Into Attic

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

Bathroom fan venting into attic.

One in line centrifugal fan can be mounted in the attic to exhaust the moisture from two bathrooms. This involves running ductwork from the fan usually though an attic and out through the roof. No you should not vent a bathroom fan directly into an attic. Both bathrooms are vented by a single in line fan that has one exhaust vent running through the roof.

Bathroom ventilation codes require a bathroom exhaust fan to vent to the exterior not the attic for health and structural reasons. 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. Exhaust air from toilet rooms and bathrooms shall not discharge into attic crawl space or other areas inside building.

Options for venting a bathroom exhaust fan include best to worst. Each fan vents separately out the roof. 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. Although this isn t always possible in attic crawl spaces you should always insulate the duct to prevent condensation problems.

However you can vent a bathroom fan through an attic while it terminates on the roof or gable end. Through the roof or an exterior gable wall. It is because of this that many builders tend to advise against this method. 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.

While this may seem obvious homeowners may out of convenience direct the vent into either of these locations. There are several other factors to consider for proper ventilation such as. Duct already wrapped in insulation at home centers. Example model ventilation codes.

You can find 4 in. In order to accomplish this the roof has to have a hole cut in it. It cannot move air to a crawlspace or attic. Depending on the location of the bathroom it may be easy to vent the exhaust fan through the roof.

Exhausting of the bath vent fan must indeed be to the building exterior.