Which system is designed to mitigate radon levels in homes?

The sub-slab depressurization system is specifically designed to reduce radon levels in homes by creating a vacuum beneath the foundation. This system works by installing a pipe that extends from beneath the building's slab to the outside atmosphere and includes a fan that draws air from beneath the slab and expels it outside. This process lowers the pressure under the slab, preventing radon gas from entering the home through cracks and openings in the foundation.

While the other systems mentioned can contribute to overall indoor air quality and comfort, they do not directly target radon mitigation. A ventilation system can help improve air exchange in a home, but it is not specifically engineered to handle radon. An air filtration system can remove various airborne contaminants but might not effectively reduce radon levels on its own. A moisture control system is important for preventing mold and structural damage, yet it does not directly mitigate radon. Thus, the sub-slab depressurization system is the most effective choice for specifically addressing radon levels in residential settings.