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How To Install

Aero Pure recommends a licensed professional should install your new bathroom ventilation fan.

But there are a few things you should know about the fan’s installation …

Installation ABCs

Installing Your New Bathroom Exhaust Fan


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

Outdoor Exhausting

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

8ft+ Ceilings

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

3/4 Inch Undercut

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

Enclosed Toilet

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

Wet Areas

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

Ducting Your New Fan

Aero Pure recommends non-perforated four-inch diameter duct which allows for easy installation between and through both eight- and ten-inch ceiling joists. Larger diameter duct may become an issue of ease-of-fit and compromise the intergrity 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

Aero Pure recommends using galvanized sheet metal or PVC duct; a smooth surface duct maximizes your fan’s airflow. Ridges in 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.

Ventilation FAQS

If there is a window in a bathroom, is it necessary to install a ventilation fan?

Windows may be a bonus to airing your bathroom out, but they are not a solution for comfortable indoor air quality. An open window may be a source for humidity, cold or hot air, dust, noise, and may even be a security risk.

Do more powerful fans cost more to operate?

There are ventilation fans available with very efficient motors that allow even powerful fans to operate quietly and cost effectively.

Is a fan’s performance and cost-efficiency affected by its installation?

Yes! Even the very best fans will operate poorly if installed improperly. To ensure quiet cost effieicent operation use smooth duct with as few bends, elbows, and angles as possible.

Does a fan need to be ducted outdoors?
Yes! Bathroom ventilation fans must be vented outdoors. If a fan is vented into the attic or ceiling joists warm moist air may compromise the structural integrity of the house and encourage mold and mildew growth.
Do powerful fans need to be loud?

Technological improvements in ventilation fan design have significantly REDUCED fan noise. Look for products with HVI-certified sound ratings of 1.0 sones or less for super quiet ventilation.