Bathroom Exhaust Fan Vent Pipe

Ceiling fans vent either into the attic or outside through the roof.

Bathroom exhaust fan vent pipe.

There are wall mount exhaust fans as well as ceiling exhaust fans. You can find 4 in. In those areas ventilation in bathrooms is required but it can be from a window or fan your choice. 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. No matter the location of the bathroom you can vent the exhaust fan through the wall. The location of the bathroom will determine how extensive the ductwork will be. All municipalities have different requirements but some do not draw a hard line on requiring exhaust fans.

A grille in each bathroom attaches to ducts which then fasten to a y connector at the fan. Required bathroom vent fan ventilation rate in cfm this ventilation code specifies a bathroom exhaust airflow rate for toilet rooms and bathrooms not served by a window of adequate size of 25 or 50 cfm ft for hotels motels resorts and dormitories and a slightly more modest 20 50 cfm for private dwellings. Although this isn t always possible in attic crawl spaces you should always insulate the duct to prevent condensation problems. In order to make the vent fan as quiet as possible mount the fan itself as far as possible from the intake register in the bathroom.

The best exhaust fan venting is through smooth rigid ducts with taped joints and screwed to a special vent hood. This setup requires an in line centrifugal fan mounted in the attic drawing air simultaneously from both bathrooms see photo. If you have a bathroom with a separate enclosed toilet you ll also need an additional fan for that space. You may be able to configure a short route.

The basics of venting a bathroom exhaust fan the bathroom exhaust ventilation fan disperses air through an opening in the fan housing which is usually 3 inches in diameter and ideally faces in the direction of the ventilation system outlet. Through the roof or an exterior gable wall. But while you can t have two fans with one vent you can make one fan and one vent serve two bathrooms. The company does not cite a maximum exhaust duct length.

Duct already wrapped in insulation at home centers. Another consideration to think about is the placement of your fan.