How To Vent A Bathroom Fan Through The Wall

In this video this old house general contractor tom silva explains how to vent a bathroom fan.

How to vent a bathroom fan through the 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. Then write these measurements on a paper. From outside use 4 inch hole saw to cut hole for wall cap. Drive nail through house wall from attic.

These aren t specifically made for bathroom fans because some people install them in kitchens garages mudrooms and other locations. Keep the run of vent pipe as short and straight as possible. Note that the bathroom vent fan must always exhaust to the outdoors. 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. Almost all fans are square or rectangular in size. 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. Through the roof or an exterior gable wall.

Behind a soffit vent. To improve venting and reduce air resistance in the vent pipe. Other venting options includes running the duct up through the roof or down through the soffit. Behind a gable vent.

It eliminates the need for routing ductwork through the house and these fans usually dry the bathroom more quickly. At first measure the length and width of the fan accurately. Now take the maker and scale to draw the exact size on the 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.

This involves running ductwork from the fan usually though an attic and out through the roof. Never allow the duct to simply blow into an attic crawlspace or other enclosed area. 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.

If you vent through the roof condensation will drip back into the interior.