A radon mitigation system needs to include which feature for safety?

A radon mitigation system should include a fan shutoff mechanism for safety because this feature helps to prevent potential hazards associated with the system's operation. The fan is responsible for creating negative pressure beneath the foundation of a building, effectively drawing radon gas from below the ground and venting it safely outside. However, if the system were to malfunction or if the fan failed, it could lead to a buildup of radon indoors, which poses health risks to occupants due to prolonged exposure to this radioactive gas.

The fan shutoff mechanism ensures that if the fan stops working for any reason, the system can alert homeowners or automatically shut down the operation to prevent the recirculation of radon into the living spaces. This proactive safety measure is vital for maintaining the effectiveness of the radon mitigation system and ensuring indoor air quality.

While other features, such as smoke detectors or security locks, are important for overall home safety, they are not specifically related to the functionality and safety of a radon mitigation system itself.