Bathroom Vent Air To The Attic

Both bathrooms are vented by a single in line fan that has one exhaust vent running through the roof.

Bathroom vent air to the attic.

Dumping bathroom exhaust into an attic or under roof space invites costly mold contamination frost under the roof in freezing climates moisture damage to roof sheathing possibly even plywood delamination or rot roof failures and shorter roof shingle life. 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. Hot air exhaust vents located at the peak of the roof allow hot air to escape.

Each bathroom has its own exhaust fan. One in line centrifugal fan can be mounted in the attic to exhaust the moisture from two bathrooms. However you can vent a bathroom fan through an attic while it terminates on the roof or gable end. 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.

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 cannot move air to a crawlspace or attic. While this may seem obvious homeowners may out of convenience direct the vent into either of these locations. Any person competent in installing an outside vent either thru the roof soffit or gable hip end of the house thru the siding.

No you cannot vent your bathroom exhaust fan into the attic. 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. It may also violate a shingle warranty. It seems like such an easy solution just leave a bathroom vent hose in an attic.

You should never exhaust the bathroom fan directly into the attic. It s all outdoor air anyways right. Each bath fan should be on a separate 4 or larger duct and the outside vent portion must have a baffle damper to prevent anything from coming into the duct work. The exhaust needs to vent outdoors.

Bathroom fan vent code requirements include no venting to attic areas to help reduce mold or structural problems. Each fan vents separately out the roof. Allowing the exhaust to vent into your attic can potentially cause several moisture problems. Bathroom ventilation codes require a bathroom exhaust fan to vent to the exterior not the attic for health and structural reasons.

Through the roof or an exterior gable wall.