How To Vent A Bathroom Exhaust Fan Through The Roof

Venting two bathroom exhaust fans through one roof duct won t work sorry to say.

How to vent a bathroom exhaust fan through the roof.

Depending on the location of the bathroom it may be easy to vent the exhaust fan through the roof. This involves running ductwork from the fan usually though an attic and out through the roof. Venting through a roof vent or exhausting them in the attic could cause moisture problems and rot. Run a thick bead of tri polymer sealant along the underside of vent hood.

Here in the north we vent the bathroom exhaust through a bulkhead to the exterior wall the exhaust ducting is insulated and has a slight slope to the exterior wall to allow any condensation to escape we also install a 5 6 length of plywood at the eaves so the exhaust can t get into the attic space. A bird s nest in a bathroom vent will greatly reduce or eliminate the effectiveness of a bathroom exhaust fan. It s also important to note that if you install a roof vent cover for a clothes dryer you must remove the metal screen because it will catch lint and may turn into a fire hazard. It eliminates the need for routing ductwork through the house and these fans usually dry the bathroom more quickly.

The master bathroom and the 2nd bathroom vent through the roof and through the same opening. In all cases the ducting needs to conduct the exchaust to the building exterior and needs to terminate in an animal proof vent cover. Vent your bath and kitchen exhaust fans through the roof through a special roof hood. Next use aviation snips to cut slits into the sheet metal sleeve.

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. But you can install one fan in your attic for both bathrooms and make your bathroom quieter too. This article describes routing bath exhaust fan duct upwards through an attic or roof space or downwards through a floor or crawl space. A down through soffit exhaust vent design by leaving warm air in the exhaust duct when the fan is off creates a heat trap that reduces heat loss out of the bathroom through the exhaust fan duct when the fan is off in comparison with up routed vents or even horizontal vents through a gable end wall.

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. 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.