Bathroom Vent Air To The Attic
It may also violate a shingle warranty.
Bathroom vent air to the attic. Allowing the exhaust to vent into your attic can potentially cause several moisture problems. 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 exhaust needs to vent outdoors. Through the roof or an exterior gable wall.
No you cannot vent your bathroom exhaust fan into the attic. It s all outdoor air anyways right. Hot air exhaust vents located at the peak of the roof allow hot air to escape. 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.
Options for venting a bathroom exhaust fan include best to worst. It cannot move air to a crawlspace or attic. You should never exhaust the bathroom fan directly into the attic. Your attic is not a temperature controlled environment is never the same temperature as your living space and generally closer to the temperature outside.
Each bathroom has its own exhaust fan. 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. 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. Each fan vents separately out the roof.
No you should not vent a bathroom fan directly into an attic. While this may seem obvious homeowners may out of convenience direct the vent into either of these locations. Taking advantage of this natural process referred to as passive ventilation is the most common way to vent an attic. Bathroom ventilation codes require a bathroom exhaust fan to vent to the exterior not the attic for health and structural reasons.
Both bathrooms are vented by a single in line fan that has one exhaust vent running through the roof. 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. The next thing you need to do is make sure the exhaust is successfully making its way out of your home.
Bathroom fan vent code requirements include no venting to attic areas to help reduce mold or structural problems.