Bathroom fan exhaust into attic. If your bathroom fan vents into the attic then you either have a really old home or a really bad contractor. However you can vent a bathroom fan through an attic while it terminates on the roof or gable end. Your attic is not a temperature-controlled environment is never the same temperature as your living space and generally closer to the temperature outside. No you cannot vent your bathroom exhaust fan into the attic. It may also violate a shingle warranty. The building code clearly states that all exhaust fans from the bathrooms should be vented outside.
Venting Bathroom Fan Into Attic. The air removed by every mechanical exhaust system shall be discharged to the outdoors. Your attic is not a temperature-controlled environment is never the same temperature as your living space and generally closer to the temperature outside. Venting the fan into the attic can cause many issues because of the moist air the fan removed from the bathroom. Things to Consider When Venting a Bathroom Exhaust Fan Through Soffit Moist Air Entering Your Attic. It may also violate a shingle warranty. Some homeowners are stubborn though.
The fact that venting bathroom exhaust into your attic is illegal should be reason enough to forget the idea. Bath fans should always exhaust outside through the roof via insulated duct and terminate on a dampered roof cap. It seems like such an easy solution just leave a bathroom vent hose in an attic. No you should not vent a bathroom fan directly into an attic.
If you are looking to install a new bathroom exhaust fan then you need to make sure that it exhausts outside of the residence as there are several legitimate and serious reasons why venting into the attic is a bad idea including the 10 we list here. In most areas of the world venting a bathroom fan directly into the attic is against code. The house is 10 years old and the ensuite where the extractor feeds from is used at least twice a day for showers. Venting the fan into the attic can cause many issues because of the moist air the fan removed from the bathroom.