Bathroom Exhaust Fans Into Attic

Mold can spread rapidly in an attic.

Bathroom exhaust fans into attic.

For instance if your home has an attic you can get to the fan from above. It seems like such an easy solution just leave a bathroom vent hose in an attic. It may also violate a shingle warranty. 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.

This makes removing the old housing and installing the new housing a much less complicated job. 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. You should never exhaust the bathroom fan directly 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.

Bath fans should always exhaust outside through the roof via insulated duct and terminate on a dampered roof cap. You can find 4 in. The best exhaust fan venting is through smooth rigid ducts with taped joints and screwed to a special vent hood. Bathroom exhaust fans perform an important function by removing excess moisture from your home.

Although this isn t always possible in attic crawl spaces you should always insulate the duct to prevent condensation problems. Ideally your fan should be near the tub or shower but not right next to an air conditioning heating vent as the forced air can create currents that disrupt the bathroom fan s steady intake of. Mold is commonly found in attics with bath fans that exhaust moist air into the attic. Click here to learn more about attic mold.

It s all outdoor air anyways right. No you should not vent a bathroom fan directly into an 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. Bathroom fan vent code requirements include no venting to attic areas to help reduce mold or structural problems.

Bathroom ventilation codes require a bathroom exhaust fan to vent to the exterior not the attic for health and structural reasons. Proper bath fan exhaust. Duct already wrapped in insulation at home centers. No you cannot vent your bathroom exhaust fan into the attic.