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What does a radon mitigation system do?  A radon mitigation system lowers the amount of soil gas entry into a structure.  This can be accomplished in several ways depending on the construction of the building.  Buildings with a basement may utilize subslab suction, drain tile suction, sump hole suction or block wall suction.  

Active subslab suction is the most common and usually the most reliable method.  Suction pipes are inserted through the floor slab into the soil underneath.  A fan connected to the pipes acts like a vacuum cleaner and draws the radon gas from below the building and releases it into the outdoor air.  Passive subslab suction is the same concept, however air currents are used instead of a fan to draw the radon.  Passive subslab suction is generally not as effective in reducing radon as active subslab suction.  Drain tile suction is often effective in reducing radon levels if the drain tiles form a complete loop around the foundation of the building.

Sump hole suction is a variation of subslab and drain tile suction.  When a building has a basement with a sump pump to remove unwanted water, the sump can be capped so it can continue to drain water and serve as a location for the radon suction pipe.

Block wall suction can be used in basements with hollow block foundation walls.  This method removes radon from the hollow spaces within the basement's concrete block wall and is often used with subslab suction.