Bathroom Exhaust Duct In Attic

In order to accomplish this the roof has to have a hole cut in it.

Bathroom exhaust duct in attic.

Bathroom vent fans are rated by how many cubic feet of air they can move in one minute known as the cfm rating. This involves running ductwork from the fan usually though an attic and out through the roof. It may also violate a shingle warranty. 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.

There we also note. Wall mount fans are mounted on an external wall of a home and are used if there isn t a way to vent through the roof as in the case of a bathroom on the first floor of a home. 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. It is because of this that many builders tend to advise against this method.

Ceiling fans vent either into the attic or outside through the roof. 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. Bathroom fan sound levels. The bathroom here is below an accessible attic so tom ran the exhaust duct across the attic and out a gable end.

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. To avoid unnecessary reductions in air movement through the bath vent exhaust system avoid elbows and bends as much as possible. To determine which size fan to buy for your bath multiply the room s square footage by 1 1. There are wall mount exhaust fans as well as ceiling exhaust fans.