Can I Vent A Bathroom Fan Into My Attic

While there are other reasons to solve bathroom ventilation problems the inconvenience of foggy mirrors for example preventing mold is the most compelling reason.

Can i vent a bathroom fan into my attic. This can also cause mold to form on wood or insulation in an attic space above a bathroom. This article describes routing bath exhaust fan duct upwards through an attic or roof space or downwards through a floor or crawl space. Depending on the location of the bathroom it may be easy to vent the exhaust fan through the roof.

In all cases the ducting needs to conduct the exchaust to the building exterior and needs to terminate in an animal proof vent cover. You d often blow air from one bathroom into the other and local building inspectors wouldn t approve it. This involves running ductwork from the fan usually though an attic and out through the roof.

Your attic is not a temperature controlled environment is never the same temperature as your living space and generally closer to the temperature outside. You should never exhaust the bathroom fan directly into the attic. Bathroom fan vent code requirements include no venting to attic areas to help reduce mold or structural problems.

So can you vent a bathroom exhaust fan into the attic. This setup requires an in line centrifugal fan mounted in the attic drawing air simultaneously from both. If you re tempted to vent your exhaust fan through an existing roof vent or even vent it into the attic don t do it.

It seems like such an easy solution just leave a bathroom vent hose in an attic. Bathroom ventilation fan duct routing routing a bath vent duct down out or up through an attic or roof out. No you should not vent a bathroom fan directly into an attic however you can vent a bathroom fan through an attic while it terminates on the roof or gable end.

But while you can t have two fans with one vent you can make one fan and one vent serve two bathrooms. 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.