Bathroom Vent Into Attic

You d often blow air from one bathroom into the other and local building inspectors wouldn t approve it.

Bathroom vent into attic. This setup requires an in line centrifugal fan mounted in the attic drawing air simultaneously from both bathrooms see photo. This article describes routing bath exhaust fan duct upwards through an attic or roof space or downwards through a floor or crawl space. 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 fan vent code requirements include no venting to attic areas to help reduce mold or structural problems. Bathroom exhaust fans perform an important function by removing excess moisture from your home. Options for venting a bathroom exhaust fan include best to worst.

No you should not vent a bathroom fan directly into an attic however you can vent a bathroom fan through an attic while it terminates on the roof or gable end. No you cannot vent your bathroom exhaust fan into the attic. Bathroom ventilation fan duct routing routing a bath vent duct down out or up through an attic or roof out.

Your attic is not a temperature controlled environment is never the same temperature as your living space and generally closer to the temperature outside. You should never exhaust the bathroom fan directly into the attic. But while you can t have two fans with one vent you can make one fan and one vent serve two bathrooms.

When venting a bathroom exhaust fan make sure to vent the air to the outside rather than into your attic where it can cause mold and mildew to form.