Installing ventilation exhaust fans in your home will help improve indoor air quality, for both your health and belongings. These fans, as the name implies, exhaust unwanted dirty, humid and/or stale air from your home to the outside. You can use this air quality checklist to see if your home would benefit from one or more exhaust fans. Typically, an exhaust fan is placed in a room such as the kitchen or bathroom to remove stale, muggy or dirty air.