Bathroom Exhaust Duct In Attic

Bathroom fan sound levels.

Bathroom exhaust duct in attic.

To avoid unnecessary reductions in air movement through the bath vent exhaust system avoid elbows and bends as much as possible. It may also violate a shingle warranty. This involves running ductwork from the fan usually though an attic and out through the roof. The building code requires a bathroom exhaust fan to vent outside the building so installation of a new bathroom fan necessarily involves installation of ductwork.

There we also note. Depending on the location of the bathroom it may be easy to vent the exhaust fan through the roof. It is because of this that many builders tend to advise against this method. To determine which size fan to buy for your bath multiply the room s square footage by 1 1.

This is much easier to do if you have attic access because if you don t you usually have to remove some ceiling drywall and run the ducts along a joist. Ceiling fans vent either into the attic or outside through 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. We explain at bathroom ventilation codes specs installers should make the bath vent fan duct run through the attic or any other space as short as possible.

Bathroom exhaust fans perform an important function by removing excess moisture from your home. The bathroom here is below an accessible attic so tom ran the exhaust duct across the attic and out a gable end. 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. There are wall mount exhaust fans as well as ceiling exhaust fans.