Bath Exhaust Fan Through Roof

Next use aviation snips to cut slits into the sheet metal sleeve.

Bath exhaust fan through roof.

Bathroom ventilation fan duct routing routing a bath vent duct down out or up through an attic or roof out. 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. The 2nd bathroom vent drips on the floor and is ruining the ceiling.

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. Bend over the tabs then nail the tabs to the roof. The master bathroom and the 2nd bathroom vent through the roof and through the same opening. Venting through a roof vent or exhausting them in the attic could cause moisture problems and rot.

This old house general contractor tom silva shows how to properly install a roof mounted bath fan vent. Run a thick bead of tri polymer sealant along the underside of vent hood. 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 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.

This article describes routing bath exhaust fan duct upwards through an attic or roof space or downwards through a floor or crawl space. See below for a shopping list and tools subscribe.