active sub-slab depressurization 4

https://radonmitigationinsight.slatecurrent.com/posts/what-to-look-for-in-a-radon-mitigation-contractor

Active sub-slab depressurization is a method used to keep radon and other soil gases from seeping into basements by creating a low-pressure zone beneath the concrete floor. A fan pulls air from under the slab, venting it safely outside. It is a practical solution often recommended for homes with high radon levels, ensuring the living spaces above stay healthier.