Whole house exhaust fan operation

Whole house fans exhaust hot air from inside the home through the attic and pull in cooler outside air. When operating properly, whole house exhaust fans provide the combined cooling effects of portable, ceiling and window fans.

Positioning whole house exhaust fans in the home

Whole house exhaust fans should be centrally located in a hallway ceiling or on a top floor.

Using whole house exhaust fans to discover leaks

Whole house exhaust fans are very useful for inspecting the envelope and air distribution system for leaks. 

Reducing heat loss when not in use

When the home is being cooled or heated by another system, reduce heat gain or loss by covering the whole house exhaust fan with an insulating blanket or installing a weather-stripped box with a removable lid.

Precaution: If installing a weather stripped box, be sure to remove the lid before operating the fan.