sub-slab depressurization system 4

https://qqpipi.com//index.php/Radon_Mitigation_York_PA:_A_Practical_Guide_for_Homeowners

A sub-slab depressurization system is a radon mitigation technique that uses a network of pipes under a concrete foundation to pull soil gases away from the building. By creating negative pressure under the slab with a fan, it vents radon and other vapors safely outside, often through a roof pipe. Homeowners dealing with indoor radon levels might see this as an effective long-term solution, though installation requires sealing cracks in the slab and routing the vent properly.