A licensed professional must install your new bathroom ventilation fan. However, here are a few things you should know about installing the fan.

Installing Your New Bathroom Exhaust Fan

Installation ABCs


Only install a properly sized fan for your bathroom and ventilation needs.

8ft+ Ceilings

Bathrooms with ceilings greater than eight feet may require additional ventilation.

Enclosed Toilet

An enclosed toilet room (as in the master bathroom) should have its own ventilation.

Outdoor Exhausting

All ventilation should be ducted outdoors- not into the ceiling joists or attic.

3/4 Inch Undercut

The bathroom door should be undercut at least 3/4″ so that fresh air may enter the room.

Wet Areas

Fans approved for installation in wet areas should be located over or very near the shower or tub.*

Ducting Your New Fan

AeroPure recommends a non-perforated four-inch diameter duct which allows for easy installation between and through both eight- and ten-inch ceiling joists. A larger diameter duct may become an issue of ease-of-fit and compromise the integrity of both the ceiling joists and the exterior aesthetics of the house.

Always use the duct diameter specified for your ventilation fan. Reducing the duct diameter will reduce the fan’s performance CFMs and increase the noise sones in your bathroom.

Smooth is Best

AeroPure recommends using galvanized sheet metal or PVC duct; a smooth surface duct maximizes your fan’s airflow. The ridges in a flexible aluminum duct and dryer duct hose will reduce your fan’s performance CFMs, add to the noise sones in the bathroom, and consume more energy.

Less is Better

Try to avoid any bends or elbows which will reduce the fan’s performance. If you must bend or elbow the duct, be sure you allow at least a two- to three-foot run out of the fan before the air passes through the first elbow.

An elbow or bend that is too close to the fan’s exhaust port will be pushed back into the fan and compromise the fan’s performance. A long-radius elbow, rather than a sharp 90° elbow, will help maximize the fan’s performance CFMs and minimize noise sones.