Bathroom Fan Venting Into Attic

In fact i have seen numerous houses that haven t yet had signs of mold with the bath fan venting incorrectly.

Bathroom fan venting into attic.

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. Can you vent a bathroom exhaust fan into the soffit vents. The truth about attic bathroom venting. This involves running ductwork from the fan usually though an attic and out through the roof.

How to install a bathroom vent fan. I would by lying if i told you that it will cause problems it may be totally fine. The lowdown on venting your bath fan into an attic is that it can be done but it should terminate on the outside. All municipalities have different requirements but some do not draw a hard line on requiring exhaust fans.

But while you can t have two fans with one vent you can make one fan and one vent serve two bathrooms. This article series explains why bathroom vent fans are needed and describes good bath vent fan choices necessary fan capacity and good bath vent fan and vent duct installation details. In all cases the ducting needs to conduct the exchaust to the building exterior and needs to terminate in an animal proof vent cover. No you cannot vent the bathroom exhaust fan into the soffit vents.

The best exhaust fan venting is through smooth rigid ducts with taped joints and screwed to a special vent hood. You d often blow air from one bathroom into the other and local building inspectors wouldn t approve it. Bath vent fan installation building codes bath vent fan troubleshooting bath vent fan repair. Bathroom code does address the issue of moving odor and moisture laden air from the bathroom to the outside.

Venting through a roof vent or exhausting them in the attic could cause moisture problems and rot. Depending on the location of the bathroom it may be easy to vent the exhaust fan through the roof. Bathroom fan vent code requirements include no venting to attic areas to help reduce mold or structural problems. Surprisingly bathroom fans are not required by some building codes.

This article describes routing bath exhaust fan duct upwards through an attic or roof space or downwards through a floor or crawl space. We explain how to install bathroom exhaust fans or vents the vent ducting. Vent your bath and kitchen exhaust fans through the roof through a special roof hood. It eliminates the need for routing ductwork through the house and these fans usually dry the bathroom more quickly.

This setup requires an in line centrifugal fan mounted in the attic drawing air simultaneously from both bathrooms see photo. 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.