A well-installed radon system lowers indoor radon by venting gas from beneath the slab or crawlspace

https://www.scribd.com/document/1008755553/Radon-System-Installation-Step-by-Step-Overview-for-Homeowners-229104

A well-installed radon system lowers indoor radon by venting gas from beneath the slab or crawlspace, using continuous fans and airtight sealing techniques.