How To Vent Bathroom Fan Through 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.

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. From outside use 4 inch hole saw to cut hole for wall cap. In this video this old house general contractor tom silva explains how to vent a bathroom fan. 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.

Installing a bath fan through a wall isn t that difficult of a job if you have the right tools. It eliminates the need for routing ductwork through the house and these fans usually dry the bathroom more quickly. Options for venting a bathroom exhaust fan include best to worst. For example a 100 square foot bath would require a 110 cfm rated fan.

This will serve as a reference point for positioning the wall cap. 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. Fans also have a sound rating measured in sones. Bathroom vent fans are rated by how many cubic feet of air they can move in one minute known as the cfm rating.

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 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. 1 climb into the attic and locate the bath fan. Keep the run of vent pipe as short and straight as possible.

Through the roof or an exterior gable 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. Drive nail through house wall from attic. Behind a gable vent.

Depending on the location of the bathroom it may be easy to vent the exhaust fan through the roof. If you vent through the roof condensation will drip back into the interior. Behind a soffit vent. However venting through the wall is considerably less risky.

This involves running ductwork from the fan usually though an attic and out 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.