Extractor Fan Venting Into Attic

Through the roof depending on the location of the bathroom it may be easy to vent the exhaust fan through the roof.

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

Although this isn t always possible in attic crawl spaces you should always insulate the duct to prevent condensation problems. Attic ventilation works on the principle that heated air naturally rises primarily utilizing two types of vents. The best exhaust fan venting is through smooth rigid ducts with taped joints and screwed to a special vent hood. For this to work properly air ducts must be properly sealed meaning no tears or holes that would allow moisture to escape into the wrong spots.

Home builders learned from this lesson and began running exhaust ventilation ducts to the outside of the home. This involves running ductwork from the fan usually though an attic and out through the roof. Duct already wrapped in insulation at home centers. A grille in each bathroom attaches to ducts which then fasten to a y connector at the fan.

Bathroom exhaust fan duct length specifications. Here we provide specifications for recommended minimum maximum duct lengths for bathroom vent fans. A bath vent fan duct that is too long may restrict air flow such that the fan is not functional. Historically extractor fans were vented into the attic of the home.

This setup requires an in line centrifugal fan mounted in the attic drawing air simultaneously from both bathrooms see photo. Roof is hipped so unfortunately gable wall is not an option. In order to accomplish this the roof has to have a hole cut in it. Bathroom exhaust fans perform an important function by removing excess moisture from your home.

But while you can t have two fans with one vent you can make one fan and one vent serve two bathrooms. Options for venting a bathroom exhaust fan include best to worst. 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.