Installing Bathroom Exhaust Fan Through Roof

The 2nd bathroom vent drips on the floor and is ruining the ceiling.

Installing bathroom exhaust fan through roof. Avoid venting through a soffit vent or ridge vent. The best exhaust fan venting is through smooth rigid ducts with taped joints and screwed to a special vent hood. This article describes routing bath exhaust fan duct upwards through an attic or roof space or downwards through a floor or crawl space. The 2 pipes one a 4 master and the other a 3 2nd do not go through the ceiling but into a common box that goes through the roof.

Run a thick bead of tri polymer sealant along the underside of vent hood. Next use aviation snips to cut slits into the sheet metal sleeve. Here this old house general contractor tom silva shows the proper way to install a bath vent fan. Venting through a roof vent or exhausting them in the attic could cause moisture problems and rot.

In all cases the ducting needs to conduct the exchaust to the building exterior and needs to terminate in an animal proof vent cover. The warm air will exhaust out the duct and enter back into the attic through the soffit vent or ridge vent. Take the end of the duct with the connector fitting and attach it to bath vent fan. Pass the opposite end of the duct through the hole in roof.

Letting the fan exhaust into an open attic will cause moisture buildup on the underside of the roof. Bend over the tabs then nail the tabs to the roof. Bathroom ventilation fan duct routing routing a bath vent duct down out or up through an attic or roof out. The first step in figuring out how to install a bathroom fan is cutting a hole based on the size of the fan you need.

We explain how to install bathroom exhaust fans or vents the vent ducting the vent termination at the wall soffit or roof vent fan wiring bath vent duct insulation bath vent lengths clearances routing and we answer just about any other bathroom ventilation design or installation question you may have. But you can install one fan in your attic for both bathrooms and make your bathroom quieter too. The master bathroom and the 2nd bathroom vent through the roof and through the same opening. Other venting options includes running the duct up through the roof or down through the soffit.

If you have access to the attic the fan can vent either through a gable wall or roof. In this particular installation tom ran the exhaust duct into the attic and through a sidewall to the outdoors. Venting two bathroom exhaust fans through one roof duct won t work sorry to say. By the diy experts of the family handyman magazine.

Small bath fans provide adequate bathroom ventilation for 79 sq ft.