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Radon Mitigation System

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It's a pressurized system that forces air into the space below the slab and thus forcing the radon to divert away from the foundation. They are not as common as the typical fan with PVC vent to exterior, but do exist. The EPA says:

9.3.7 Under conditions where soil is highly permeable, reversing the air flow in an active sub-slab depressurization system and forcing air beneath the slab may be effective in reducing indoor radon levels. (Note: The long-term effect of active sub-slab depressurization or pressurization on the soil beneath building foundations has not been determined. Until ongoing research produces definitive data, in areas where expansive soils or other unusual soil conditions exist, the local soils engineer shall be consulted during the design and installation of sub-slab depressurization or pressurization systems.)


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