Vent Fan Ducting In Attic

Bathrooms require exhaust venting fans in some communities this section may be in lieu of section r303 3 or in addition to it.

Vent fan ducting in attic.

A grille in each bathroom attaches to ducts which then fasten to a y connector at the fan. Duct already wrapped in insulation at home centers. A 3 or 4 inch duct connects to the outlet on the fan housing and runs to a side wall or to the roof and connects to a vent cap that allows the exhaust to disperse outdoors. This american designed fan is designed to reduce attic temperatures and remove destructive moisture thus making your home more comfortable and reducing the load on your hvac system and lowering your electricity bills.

But while you can t have two fans with one vent you can make one fan and one vent serve two bathrooms. 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. These ducts should be insulated or replaced with pre fab insulated ductwork or flexduct and a better installation would have shortened that very long duct as much as possible exiting to a soffit closer to the bathroom.

This setup requires an in line centrifugal fan mounted in the attic drawing air simultaneously from both bathrooms see photo. 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 article describes routing bath exhaust fan duct upwards through an attic or roof space or downwards through a floor or crawl space. Our photo above shows a long routing of bath vent fan ducts across an attic floor to an exit at the building soffit or eaves and the condensation of moisture in such vent lines.

Up through roof down through floor or crawl area. Bath vent fan duct routing. Bathroom exhaust fans perform an important function by removing excess moisture from your home. 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.

The best exhaust fan venting is through smooth rigid ducts with taped joints and screwed to a special vent hood.