sub-slab depressurization 2

https://radonservicesmenotes.juniperbrief.com/posts/finding-reliable-radon-services-near-me-in-st.-charles-county

Sub-slab depressurization is a radon mitigation technique where a pipe is inserted through the concrete floor slab into the soil or gravel beneath, and a fan creates negative pressure to pull radon gas from under the house and vent it safely outside before it can enter the living space.