Bathroom Exhaust Fan Vented Into Attic

The lowdown on venting your bath fan into an attic is that it can be done but it should terminate on the outside.

Bathroom exhaust fan vented into attic.

This setup requires an in line centrifugal fan mounted in the attic drawing air simultaneously from both bathrooms see photo. Never allow the duct to simply blow into an attic crawlspace or other enclosed area. In fact i have seen numerous houses that haven t yet had signs of mold with the bath fan venting incorrectly. 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.

Bathroom exhaust fans perform an important function by removing excess moisture from your home. You d often blow air from one bathroom into the other and local building inspectors wouldn t approve it. Note that the bathroom vent fan must always exhaust to the outdoors. But while you can t have two fans with one vent you can make one fan and one vent serve two bathrooms.

In all cases the ducting needs to conduct the exchaust to the building exterior and needs to terminate in an animal proof vent cover. Also the installation of the bathroom exhaust fan will go much quicker if you ask a spouse or friend to help be in the attic while you work from below or to hand you tools while you re on. Can you vent a bathroom exhaust fan into the soffit vents. Bathroom ventilation fan duct routing routing a bath vent duct down out or up through an attic or roof out.

I would by lying if i told you that it will cause problems it may be totally fine. If you vent the bathroom exhaust fan to close to the soffit vents which are vented plates under your homes outer edge and roof your home the air can be sucked right back into the attic from the soffit. The truth about attic bathroom venting. No you cannot vent the bathroom exhaust fan into the soffit vents.