radon fan installation

https://theradonfanreplacementblog.brightpathdigest.com/posts/when-your-radon-fan-fails-a-guide-to-radon-fan-replacement

Installing a radon fan is a critical step in mitigating indoor radon levels, often involving running a vent pipe from the sub-slab to the attic or outside. The fan, typically placed in the attic or on an exterior wall, creates negative pressure under the foundation to pull radon gas away from the house. Getting the fan sized right and sealed properly makes all the difference, since a drafty setup won't do much good against that invisible radioactive gas.