Bathroom Exhaust Fan Vented Into Attic

No you cannot vent the bathroom exhaust fan into the soffit vents.

Bathroom exhaust fan vented into attic. I would by lying if i told you that it will cause problems it may be totally fine. Bathroom ventilation fan duct routing routing a bath vent duct down out or up through an attic or roof out. The truth about attic bathroom venting. Bathroom fan vent code requirements include no venting to attic areas to help reduce mold or structural problems.

This setup requires an in line centrifugal fan mounted in the attic drawing air simultaneously from both bathrooms see photo. 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. In fact i have seen numerous houses that haven t yet had signs of mold with the bath fan venting incorrectly. The lowdown on venting your bath fan into an attic is that it can be done but it should terminate on the outside.

But while you can t have two fans with one vent you can make one fan and one vent serve two bathrooms. Can you vent a bathroom exhaust fan into the soffit vents. 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. Never allow the duct to simply blow into an attic crawlspace or other enclosed area.

This article describes routing bath exhaust fan duct upwards through an attic or roof space or downwards through a floor or crawl space. 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 ventilation codes require a bathroom exhaust fan to vent to the exterior not the attic for health and structural reasons. Note that the bathroom vent fan must always exhaust to the outdoors.