A properly installed radon system includes airtight sealing of cracks, cold joints

https://www.scribd.com/document/1009253146/How-Quiet-Is-a-Radon-System-Noise-and-Aesthetics-Explained-135787

A properly installed radon system includes airtight sealing of cracks, cold joints, and utility penetrations to prevent radon from bypassing the suction field.