How To Vent A Bathroom Fan In The Attic

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.

How to vent a bathroom fan in the attic.

The truth about attic bathroom venting. A grille in each bathroom attaches to ducts which then fasten to a y connector at the fan. If you vent through the roof condensation will drip back into the interior. This involves running ductwork from the fan usually though an attic and out through the roof.

No you cannot vent the bathroom exhaust fan into the soffit vents. To determine which size fan to buy for your bath multiply the room s square footage by 1 1. Bathroom exhaust fans perform an important function by removing excess moisture from your 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.

But while you can t have two fans with one vent you can make one fan and one vent serve two bathrooms. The best exhaust fan venting is through smooth rigid ducts with taped joints and screwed to a special vent hood. 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. I would by lying if i told you that it will cause problems it may be totally fine.

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. Options for venting a bathroom exhaust fan include best to worst. In fact i have seen numerous houses that haven t yet had signs of mold with the bath fan venting incorrectly.

The bathroom here is below an accessible attic so tom ran the exhaust duct across the attic and out a gable end. 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. It eliminates the need for routing ductwork through the house and these fans usually dry the bathroom more quickly. Bathroom vent fans are rated by how many cubic feet of air they can move in one minute known as the cfm rating.

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. Depending on the location of the bathroom it may be easy to vent the exhaust fan through the roof. Venting through a roof vent or exhausting them in the attic could cause moisture problems and rot.