How To Vent A Bathroom Fan In The Attic

Bathroom vent fans are rated by how many cubic feet of air they can move in one minute known as the cfm rating.

How to vent a bathroom fan in the attic.

Venting through a roof vent or exhausting them in the attic could cause moisture problems and rot. A grille in each bathroom attaches to ducts which then fasten to a y connector at the fan. Can you vent a bathroom exhaust fan into the soffit vents. This involves running ductwork from the fan usually though an attic and out through the roof.

The bathroom here is below an accessible attic so tom ran the exhaust duct across the attic and out a gable end. It eliminates the need for routing ductwork through the house and these fans usually dry the bathroom more quickly. 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.

If you vent the bathroom exhaust fan to close to the soffit vents which are vented plates under your homes outer edge and roof your home the air can be sucked right back into the attic from the soffit. I recommend that my clients vent their bath fans out a gable wall if at all possible when not using an hrv or erv that is. To determine which size fan to buy for your bath multiply the room s square footage by 1 1. 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 lowdown on venting your bath fan into an attic is that it can be done but it should terminate on the outside. Depending on the location of the bathroom it may be easy to vent the exhaust fan through the roof. The truth about attic bathroom venting. 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. If you vent through a soffit where attic vents are often located the moisture will get sucked back up into the attic or roof venting. I would by lying if i told you that it will cause problems it may be totally fine. No you cannot vent the bathroom exhaust fan into the soffit vents.

Vent your bath and kitchen exhaust fans through the roof through a special roof hood. This setup requires an in line centrifugal fan mounted in the attic drawing air simultaneously from both bathrooms see photo. In fact i have seen numerous houses that haven t yet had signs of mold with the bath fan venting incorrectly.