HVAC exhaust fans are an important component of any HVAC system. They are responsible for removing stale air, odors, and other contaminants from the interior of a building. The exhaust fan draws air from the interior of the building and expels it outside. This helps to maintain a healthy indoor air quality and reduce the risk of airborne illnesses. Additionally, the exhaust fan helps to regulate the temperature of the building by removing hot air and replacing it with cooler air from outside. This helps to keep the building comfortable and energy efficient.