In Attic Bathroom Exhaust Fan

Both bathrooms are vented by a single in line fan that has one exhaust vent running through the roof.

In attic bathroom exhaust fan.

Condensate may also be dripping off the exterior surface of the vent duct in attic or crawl space. You ve now put the water right back up into the attic without realizing it. The fan is able to accommodate anywhere from 1 200 to 1 800 square feet of attic space. No it s never a good idea to have any exhaust fan in your home dump all that hot moist air in your 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. Each bathroom has its own exhaust fan. Bath exhaust is almost always warm and this air will float up and into the soffit ventilation openings. 2 moisture droplets dripping from the exhaust fan or ducting.

As warm moist air moves through a fans vent system in the attic the duct often become cooler especially in the winter thus condensate may form and drip back down through the fan itself. Most roof overhangs today have continuous soffit ventilation strips. Each fan vents separately out the roof. Air vent 18 inch dia electric gable vent fan courtesy of home depot.

Bath exhaust is almost always warm and this air will float up and into the soffit ventilation openings. Surprisingly bathroom fans are not required by some building codes. It s perfect for reducing cooling costs as it pulls fresh air from outside and expels warm attic air out through the exhaust vents. One in line centrifugal fan can be mounted in the attic to exhaust the moisture from two bathrooms.

In those areas ventilation in bathrooms is required but it can be from a window or fan your choice. Section 1203 4 2 1 of california s building code requires all bathrooms with a bathtub shower spa or similar fixtures to be ventilated by an exhaust fan. 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. You ve now put the water right back up into the attic without realizing it.

It seems like such an easy solution just leave a bathroom vent hose in an attic. However you can vent a bathroom fan through an attic while it terminates on the roof or gable end. Just a year ago i saw the absolute best bath exhaust fan roof cap. You should never exhaust the bathroom fan directly into the attic.

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