Bath Fan Vents To Attic

You should never exhaust the bathroom fan directly into the attic.

Bath fan vents to attic.

It can be an ugly sight to crawl above a poorly ventilated bathroom s ceiling. The exhaust vent must terminate outdoors. A grille in each bathroom attaches to ducts which then fasten to a y connector at the fan. No you cannot vent your bathroom exhaust fan into the attic.

Because the fan is in the attic you ll hardly hear it. The correct way to vent a bathroom fan through an attic is to terminate the vent either to the roof or to the gable wall. This system is quiet too. I recommend that my clients vent their bath fans out a gable wall if at all possible when not using an hrv or erv that is.

Look for the special fans starting at 160 at heating cooling equipment dealers. A single exhaust exits through the roof figure a. If you vent through the roof condensation will drip back into the interior. Venting through a roof vent or exhausting them in the attic could cause moisture problems and rot.

Vent your bath and kitchen exhaust fans through the roof through a special roof hood. In order to accomplish this the roof has to have a hole cut in it. You mount a switch in each bathroom. Bathroom fan vent code requirements include no venting to attic areas to help reduce mold or structural problems.

Otherwise you re inviting a moisture mold rot insect problem in the building. 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. If you vent through a soffit where attic vents are often located the moisture will get sucked back up into the attic or roof venting. Either way the vent will have to go directly to the outside and installed with a vent hood cover.

Depending on the location of the bathroom it may be easy to vent the exhaust fan 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. This involves running ductwork from the fan usually though an attic and out through the roof. Do not simply terminate a bath vent fan duct in an attic as shown in our photo above nor can you just dump the exhaust vent into a crawl space nor into a closed wall floor or ceiling cavity.

Bathroom ventilation codes require a bathroom exhaust fan to vent to the exterior not the attic for health and structural reasons.