A. A technique that mechanically creates a suction on the soil beneath the structure (home). Because the suction produced by the system under the house is greater than the suction exerted by the house, the radon is vacuumed out of the soil before it has a chance to enter the home. The system’s vacuum is created by an in-line fan. The fan is attached to a depressurization piping system and operates continuously, creating a vacuum on the radon entry points. The radon can be captured and safely vented away from the home.