Exhaust Fan Into Roof

No you should not vent a bathroom fan directly into an attic.

Exhaust fan into roof.

Through the roof or an exterior gable wall. It s all outdoor air anyways right. Hd and lowes sell soffit vents. When i put in a new exhaust fan in our bathroom the builder never put any exhaust to the roof.

Options for venting a bathroom exhaust fan include best to worst. Go into the attic if you chose a ceiling exit and run the duct from the hole to an external wall or your roof. For a ceiling exit mark where you are going to cut the second hole for exiting from the house. If you vent the bathroom exhaust fan to close to the soffit vents which are vented plates under your homes outer edge and roof your home the air can be sucked right back into the attic from the soffit.

It seems like such an easy solution just leave a bathroom vent hose in an attic. Each bathroom has its own exhaust fan. Make sure the duct protrudes a little out both the ceiling and the exit point. Once inside the air heats up and rises higher ultimately exiting through venting at the roof s gables through ridge vents cut into the roof s apex or other vent holes in the roof.

Each fan vents separately out the roof. Start in the attic and drill a hole through the roof in the desired vent location. 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. One in line centrifugal fan can be mounted in the attic to exhaust the moisture from two bathrooms.

Vent exhaust fans through a roof hood roof vent hood details. I did not want to punch a hole into the roof so i ran the exhaust over to the soffit and installed it there with a vent. 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. No you cannot vent the bathroom exhaust fan into the soffit vents.

Use stiff or flex ducting depending on your needs. It may also violate a shingle warranty. As the air leaves it creates negative pressure behind it sucking in cool air from below into the soffits and creating a self repeating ventilation process. However you can vent a bathroom fan through an attic while it terminates on the roof or gable end.

Intake vents located at the lowest part of the roof under the eaves allow cool air to enter the attic. Both bathrooms are vented by a single in line fan that has one exhaust vent running through the roof. The best exhaust fan venting is through smooth rigid ducts with taped joints and screwed to a. It was just venting into the attic.

Florida home 30 years.