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

https://jasperluvt109.theglensecret.com/st-louis-radon-safety-annual-maintenance-for-your-radon-system

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