sub-slab depressurization 5

https://fun-wiki.win/index.php/Why_a_Radon_Retest_After_Repair_Is_Essential_for_Your_Home

Sub-slab depressurization is a method used to keep radon gas from seeping into basements by creating a vacuum beneath the concrete floor. A fan system pulls air from below the slab and vents it safely outside, which reduces the pressure difference that draws radon upward. It's a common fix in homes with high radon levels, typically installed by contractors who drill a small hole and set up piping. The system runs quietly and continuously, making it a practical solution for improving indoor air…