Venting A Bathroom Exhaust Fan Into Attic

No you cannot vent your bathroom exhaust fan into the attic.

Venting a bathroom exhaust fan into attic. You should never exhaust the bathroom fan directly into the attic. Options for venting a bathroom exhaust fan include best to worst. The excessive moisture will cause condensation on the roof members insulation and eventually cause mold. Bathroom ventilation codes require a bathroom exhaust fan to vent to the exterior not the attic for health and structural reasons.

The lowdown on venting your bath fan into an attic is that it can be done but it should terminate on the outside. I recently added ducting and vented it out on the roof i did the installation myself with a 25 roof venting kit i bought off amazon that includes the roof vent and exhaust duct it only took about an hour and was definitely worth it. Bathroom exhaust fans perform an important function by removing excess moisture from your home. This article describes routing bath exhaust fan duct upwards through an attic or roof space or downwards through a floor or crawl space.

Vent your bath and kitchen exhaust fans through the roof through a special roof hood. Venting through a roof vent or exhausting them in the attic could cause moisture problems and rot. Your attic is not a temperature controlled environment is never the same temperature as your living space and generally closer to the temperature outside. Bathroom vent fans must be vented to the out of doors.

In fact i have seen numerous houses that haven t yet had signs of mold with the bath fan venting incorrectly. It eliminates the need for routing ductwork through the house and these fans usually dry the bathroom more quickly. This involves running ductwork from the fan usually though an attic and out through the roof. Venting this fan into the attic is simply asking for problems.

Bathroom ventilation fan duct routing routing a bath vent duct down out or up through an attic or roof out. Bathroom fan vent code requirements include no venting to attic areas to help reduce mold or structural problems. It is never ok to vent directly into an attic even if the attic itself is vented. I had an exhaust br fan that was vented into the attic when i bought a place condensation from the fan led to water damage on the ceiling s drywall.

In all cases the ducting needs to conduct the exchaust to the building exterior and needs to terminate in an animal proof vent cover. I would by lying if i told you that it will cause problems it may be totally fine. So the simple correct answer is no. The truth about attic bathroom venting.

Surprisingly bathroom fans are not required by some building codes. The best exhaust fan venting is through smooth rigid ducts with taped joints and screwed to a special vent hood. All municipalities have different requirements but some do not draw a hard line on requiring exhaust fans.