The purpose of a radon exhaust fan is to reduce the levels of radon gas in a home or building. Radon is a naturally occurring radioactive gas that can seep into homes and buildings through cracks in the foundation or other openings. Elevated levels of radon can pose a health risk, as radon exposure has been linked to an increased risk of lung cancer.
A radon exhaust fan is typically part of a radon mitigation system, which is designed to reduce the levels of radon gas in a home or building. The fan is installed in the attic or an exterior location, and it creates negative air pressure beneath the building's foundation. This negative pressure helps to draw radon gas out of the soil before it can enter the home, and the fan then vents the gas outside the home.