Venting Bathroom Fan Into Attic

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. In fact i have seen numerous houses that haven t yet had signs of mold with the bath fan venting incorrectly. This article describes routing bath exhaust fan duct upwards through an attic or roof space or downwards through a floor or crawl space.

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Venting through a roof vent or exhausting them in the attic could cause moisture problems and rot.

Venting bathroom fan into attic. 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. Bathroom ventilation fan duct routing routing a bath vent duct down out or up through an attic or roof out. It eliminates the need for routing ductwork through the house and these fans usually dry the bathroom more quickly.

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. I would by lying if i told you that it will cause problems it may be totally fine. The truth about attic bathroom venting.

Surprisingly bathroom fans are not required by some building codes. Options for venting a bathroom exhaust fan include best to worst. Depending on the location of the bathroom it may be easy to vent the exhaust fan through the roof. 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.

Bathroom ventilation codes require a bathroom exhaust fan to vent to the exterior not the attic for health and structural reasons. This involves running ductwork from the fan usually though an attic and out through the roof. 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.

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

This setup requires an in line centrifugal fan mounted in the attic drawing air simultaneously from both bathrooms see photo. The lowdown on venting your bath fan into an attic is that it can be done but it should terminate on the outside. Vent your bath and kitchen exhaust fans through the roof through a special roof hood.