How To Vent A Bathroom Fan

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

How to vent a bathroom fan. In addition to low profile bathroom exhaust fans there are also through the wall ventilation fans which you can install in your bathroom. 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. Then drill a hole on the roof top.

Options for venting a bathroom exhaust fan include best to worst. Fans also have a sound rating measured in sones. To determine which size fan to buy for your bath multiply the room s square footage by 1 1. To vent a bath fan through the roof you must first prepare a ductwork connecting the roof top to the bathroom.

When venting a bathroom exhaust fan make sure to vent the air to the outside rather than into your attic where it can cause mold and mildew to form. For bathroom over 100 sq ft use a large or exhaust fan to circulate the air. These aren t specifically made for bathroom fans because some people install them in kitchens garages mudrooms and other locations. From outside use 4 inch hole saw to cut hole for wall cap.

Through the roof or an exterior gable wall. Small bath fans provide adequate bathroom ventilation for 79 sq ft. For example a 100 square foot bath would require a 110 cfm rated fan. Behind a gable vent.

Over there mount the vent hood using tri polymeric locking seal paste and put the nails to strengthen it. Drive nail through house wall from attic.