How To Vent Bathroom Fan Through Wall

Behind a gable vent.

How to vent bathroom fan through wall.

This involves running ductwork from the fan usually though an attic and out through the roof. 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 fan can be vented either through the ceiling or wall. It can probably be done in an afternoon if you are organized for the job but it may take a weekend if you aren t fully prepared.

Installing a bath fan through a wall isn t that difficult of a job if you have the right tools. Options for venting a bathroom exhaust fan include best to worst. A down through soffit exhaust vent design by leaving warm air in the exhaust duct when the fan is off creates a heat trap that reduces heat loss out of the bathroom through the exhaust fan duct when the fan is off in comparison with up routed vents or even horizontal vents through a gable end wall. 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.

Keep the run of vent pipe as short and straight as possible. From outside use 4 inch hole saw to cut hole for wall cap. 1 climb into the attic and locate the bath fan. 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.

For example a 100 square foot bath would require a 110 cfm rated fan. Fans also have a sound rating measured in sones. In this video this old house general contractor tom silva explains how to vent a bathroom fan. To determine which size fan to buy for your bath multiply the room s square footage by 1 1.

If you want to vent a bathroom fan through an exterior wall you will have to cut a 3 inch or 4 inch hole with a hole. It eliminates the need for routing ductwork through the house and these fans usually dry the bathroom more quickly. Depending on the location of the bathroom it may be easy to vent the exhaust fan through the roof. However venting through the wall is considerably less risky.

If you vent through the roof condensation will drip back into the interior. Bathroom vent fans are rated by how many cubic feet of air they can move in one minute known as the cfm rating. Behind a soffit vent. This will serve as a reference point for positioning the wall cap.

To improve venting and reduce air resistance in the vent pipe. Drive nail through house wall from attic.