How To Vent Bathroom Fan Through Wall

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.

How to vent bathroom fan through wall.

To determine which size fan to buy for your bath multiply the room s square footage by 1 1. However venting through the wall is considerably less risky. Through the roof or an exterior gable wall. Keep the run of vent pipe as short and straight as possible.

Installing a bath fan through a wall isn t that difficult of a job if you have the right tools. Drive nail through house wall from attic. The fan can be vented either through the ceiling or wall. 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.

From outside use 4 inch hole saw to cut hole for wall cap. 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. This involves running ductwork from the fan usually though an attic and out through the roof. Bathroom vent fans are rated by how many cubic feet of air they can move in one minute known as the cfm rating.

This will serve as a reference point for positioning the wall cap. Fans also have a sound rating measured in sones. Depending on the location of the bathroom it may be easy to vent the exhaust fan through the roof. It eliminates the need for routing ductwork through the house and these fans usually dry the bathroom more quickly.

Behind a soffit vent. For example a 100 square foot bath would require a 110 cfm rated fan. Options for venting a bathroom exhaust fan include best to worst. 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.

To improve venting and reduce air resistance in the vent pipe. 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. 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. Behind a gable vent.

In this video this old house general contractor tom silva explains how to vent a bathroom fan. 1 climb into the attic and locate the bath fan.