What is the primary role of a depressurization fan in radon mitigation systems?

The primary role of a depressurization fan in radon mitigation systems is to reduce radon concentration in homes and buildings. Radon is a naturally occurring radioactive gas that can accumulate in enclosed spaces, particularly in basements and lower levels of buildings. By creating a negative pressure in the soil beneath a structure, the depressurization fan effectively pulls radon gas out of the ground and prevents it from entering the indoor environment.

This process is essential because it reduces the potential health risks associated with radon exposure, which is linked to lung cancer. The fan works as part of a larger mitigation system that often includes a network of piping and a vent that directs the radon gas safely away from the structure, usually to the outdoors where it can dissipate without endangering inhabitants.

While other options describe actions that might occur within a building, they do not align with the primary purpose of a depressurization fan in radon mitigation. The emphasis here is on the fan's critical function in lowering radon levels and thus improving indoor air quality and safety for residents.