An exhaust fan is a mechanical device designed to remove stale air, moisture, and odors from a specific area, such as a kitchen or bathroom. It works by drawing air out of the room and expelling it outside, helping to improve indoor air quality and prevent the buildup of humidity. These fans are commonly installed in areas where ventilation is crucial. For example, in a kitchen, an exhaust fan helps eliminate smoke and cooking smells, while in a bathroom, it reduces moisture that can lead to mold growth. Proper installation and maintenance ensure optimal performance and longevity.