Bathroom Exhaust Fan Through Flat 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.

Bathroom exhaust fan through flat roof. This discussion is now found at bathroom vent up through roof. Bath exhaust fans routed up through the roof. Our state s weatherization field guide indicates that vent terminations shall not be allowed on flat roofs. If you have access to the attic the fan can vent either through a gable wall or roof.

Vent your bath and kitchen exhaust fans through the roof through a special roof hood. Avoid venting through a soffit vent or ridge vent. Venting through a roof vent or exhausting them in the attic could cause moisture problems and rot. Broan surfaceshield vital vio powered exhaust fan w led light antibacterial light.

Bathroom ventilation fan duct routing routing a bath vent duct down out or up through an attic or roof out. This article describes routing bath exhaust fan duct upwards through an attic or roof space or downwards through a floor or crawl space. The warm air will exhaust out the duct and enter back into the attic through the soffit vent or ridge vent. Fans with surfaceshield technology combine the power of broan nutone s bathroom ventilation fans with vital vio s led light technology to prevent the growth of bacteria mold yeast and fungi.

The best exhaust fan venting is through smooth rigid ducts with taped joints and screwed to a special vent hood. My interpretation is that you are not allowed to place a fan vent termination on a flat roof. I prefer to run a bath vent to outdoors via a horizontal line that goes across an attic and out through a gable end wall or one that vents down and outside through a roof overhang or soffit. I am interested in learning if there is guidance or code that would cover venting a bath fan straight up through a flat roof.

It also indicates that on sloped roof the termination should be.