How To Vent Bathroom Fan Through Wall

The fan can be vented either through the ceiling or wall.

How to vent bathroom fan through wall.

To improve venting and reduce air resistance in the vent pipe. 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. Options for venting a bathroom exhaust fan include best to worst. Depending on the location of the bathroom it may be easy to vent the exhaust fan through the roof.

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. Bathroom vent fans are rated by how many cubic feet of air they can move in one minute known as the cfm rating. Fans also have a sound rating measured in sones. 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.

Behind a soffit vent. Drive nail through house wall from attic. 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. 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.

From outside use 4 inch hole saw to cut hole for wall cap. Installing a bath fan through a wall isn t that difficult of a job if you have the right tools. Behind a gable vent. This will serve as a reference point for positioning the wall cap.

However venting through the wall is considerably less risky. 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. 1 climb into the attic and locate the bath fan.

Since a bathroom vent fan should run for 10 15 minutes after you finish your shower to remove all the moisture consider a fan that cuts on and off automatically using a moisture sensor or replace the wall switch with a timer. For example a 100 square foot bath would require a 110 cfm rated 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.

Keep the run of vent pipe as short and straight as possible. To determine which size fan to buy for your bath multiply the room s square footage by 1 1.