Extractor Fan Venting Into Attic

Bathroom exhaust fans perform an important function by removing excess moisture from your home.

Extractor fan venting into attic.

This involves running ductwork from the fan usually though an attic and out through the roof. 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. A bath vent fan duct that is too long may restrict air flow such that the fan is not functional.

Guys you could get a hole bored on your gable wall from the attic through too the outside ther are companies who specialise in hole boring get out the yellow pages then connect the extractor and the hole with a flexi hose. Here we provide specifications for recommended minimum maximum duct lengths for bathroom vent fans. Historically extractor fans were vented into the attic of the home. Although this isn t always possible in attic crawl spaces you should always insulate the duct to prevent condensation problems.

Home builders learned from this lesson and began running exhaust ventilation ducts to the outside of the home. 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. Options for venting a bathroom exhaust fan include best to worst. Duct already wrapped in insulation at home centers.

The best exhaust fan venting is through smooth rigid ducts with taped joints and screwed to a special vent hood. Roof is hipped so unfortunately gable wall is not an option. This setup requires an in line centrifugal fan mounted in the attic drawing air simultaneously from both bathrooms see photo. Through the roof depending on the location of the bathroom it may be easy to vent the exhaust fan through the roof.

In order to accomplish this the roof has to have a hole cut in it. Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents. But while you can t have two fans with one vent you can make one fan and one vent serve two bathrooms. Bathroom exhaust fan duct length specifications.

Intake vents located at the lowest part of the roof under the eaves allow cool. You can find 4 in. You should never exhaust the bathroom fan directly into the attic.