How To Vent A Bathroom Fan Out The Roof

If you have two bathrooms that are close together and one has an exhaust fan and the other doesn t you might be wondering if you can tie a new exhaust duct into the existing one.

How to vent a bathroom fan out the roof.

Take the end of the duct with the connector fitting and attach it to bath vent fan. I would recommend installing a bath fan with a new vent that goes to the gable wall roof or even the soffit last choice. Special bathroom fan roof vents with an internal damper that opens only when the fan is blowing will send moist air outdoors and keep cold air out of the house. If you vent through the roof condensation will drip back into the interior.

If you vent through a soffit where attic vents are often located the moisture will get sucked back up into the attic or roof venting. 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. Each fan vents separately out the roof. In all cases the ducting needs to conduct the exchaust to the building exterior and needs to terminate in an animal proof vent cover.

You may just want to go with a completely new vent the whole way most modern bathroom fans require 4 or 6 vent hoses for much better performance and lower noise. I recommend that my clients vent their bath fans out a gable wall if at all possible when not using an hrv or erv that is. Run a thick bead of tri polymer sealant along the underside of vent hood. Depending on the location of the bathroom it may be easy to vent the exhaust fan through the roof.

How to repair a bathroom fan. The master bathroom and the 2nd bathroom vent through the roof and through the same opening. Each bathroom has its own exhaust fan. This involves running ductwork from the fan usually though an attic and out through the roof.

It eliminates the need for routing ductwork through the house and these fans usually dry the bathroom more quickly. Bend over the tabs then nail the tabs to the roof. The 2nd bathroom vent drips on the floor and is ruining the ceiling. Next use aviation snips to cut slits into the sheet metal sleeve.

This article describes routing bath exhaust fan duct upwards through an attic or roof space or downwards through a floor or crawl space.