Bath Fan Vents Into Attic

Bath vent fan installation building codes bath vent fan troubleshooting bath vent fan repair.

Bath fan vents into attic.

The best exhaust fan venting is through smooth rigid ducts with taped joints and screwed to a special vent hood. 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. You d often blow air from one bathroom into the other and local building inspectors wouldn t approve it. In fact i have seen numerous houses that haven t yet had signs of mold with the bath fan venting incorrectly.

Next make sure it is securely fastened on both ends of the pipe. The lowdown on venting your bath fan into an attic is that it can be done but it should terminate on the outside. Most bath vents for homes are 3. But while you can t have two fans with one vent you can make one fan and one vent serve two bathrooms.

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 recommend replacing the vent pipe with insulated vent pipe. Now where the discharge point is is going to be up to you. Can you vent a bathroom exhaust fan into the soffit vents.

No you cannot vent the bathroom exhaust fan into the soffit vents. This setup requires an in line centrifugal fan mounted in the attic drawing air simultaneously from both bathrooms see photo. That will take it from the bath exhaust fan to a discharge point. So what you want to do is you want to install a duct a vent duct and you can use flex duct for this.

I see many questions about leaking bath exhaust vents. Venting through a roof vent or exhausting them in the attic could cause moisture problems and rot. Next make sure you have one of the new roof exhaust vents on the roof and properly sealed. Bathroom fan vent code requirements include no venting to attic areas to help reduce mold or structural problems.

How to install a bathroom vent fan. All municipalities have different requirements but some do not draw a hard line on requiring exhaust fans. 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. Bathroom ventilation codes require a bathroom exhaust fan to vent to the exterior not the attic for health and structural reasons.

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. This article describes routing bath exhaust fan duct upwards through an attic or roof space or downwards through a floor or crawl space. I would by lying if i told you that it will cause problems it may be totally fine.