Bathroom Exhaust Fan Goes Into Attic

It cannot move air to a crawlspace or attic.

Bathroom exhaust fan goes into attic.

Depending on the location of the bathroom it may be easy to vent the exhaust fan through the roof. For optimum performance locate it between the shower and the toilet. This section notes that air exhausted from the bathroom must be sent outdoors not indoors to the same residence or indoors to any other dwelling unit. This involves running ductwork from the fan usually though an attic and out through the roof.

Mold is commonly found in attics with bath fans that exhaust moist air into the attic. It is because of this that many builders tend to advise against this method. If you have two bathrooms that are close together and one has an exhaust fan and the other doesn t you might be wondering if you can tie a new exhaust duct into the existing one. 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. Click here to learn more about attic mold. No it s never a good idea to have any exhaust fan in your home dump all that hot moist air in your attic. It may also violate a shingle warranty.

Several different ways you can move that hot air to the outside. No you cannot vent your bathroom exhaust fan into the attic. 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.

One attic mounted fan for two bathrooms one in line centrifugal fan can be mounted in the attic to exhaust the moisture from two bathrooms. Mold can spread rapidly in an attic. In order to accomplish this the roof has to have a hole cut in it. Use an extra long 3 8 inch diameter spade bit to bore a reference hole through the ceiling and into the attic.

Proper bath fan exhaust. Climb into the attic and clear away any insulation from around the hole. Draw a mark on the bathroom ceiling where you d like to install the vent fan. It s all outdoor air anyways right.

It can cause you a lot of problems with mold and mildew forming on the underside of your rafters and decking as well as getting into your insulation. It seems like such an easy solution just leave a bathroom vent hose in an attic.