Bath Exhaust Fan Through Roof

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

Bath exhaust fan through 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. In all cases the ducting needs to conduct the exchaust to the building exterior and needs to terminate in an animal proof vent cover. This old house general contractor tom silva shows how to properly install a roof mounted bath fan vent.

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. Bathroom ventilation fan duct routing routing a bath vent duct down out or up through an attic or roof out. Run a thick bead of tri polymer sealant along the underside of vent hood. Pass the opposite end of the duct through the hole in roof.

Take the end of the duct with the connector fitting and attach it to bath vent fan. The best exhaust fan venting is through smooth rigid ducts with taped joints and screwed to a special vent hood. See below for a shopping list and tools subscribe. Vent your bath and kitchen exhaust fans through the roof through a special roof hood.

The master bathroom and the 2nd bathroom vent through the roof and through the same opening. The alternative to a roof exhaust if you re concerned about not being able to seal the hole in the roof is to exhaust through a gable end.