Hey, I just installed my radon mitigation system and my levels dropped form 17 to 7. However, I just installed the u-tube to check the vacuum pressure and it is .3 when I suppose it should be at least 1. I disconnected all the pipes and just ran a single pipe to ensure there are no leaks within the joints and just put the fan right on top. But still no vacuum pressure. Any ideas? Should I go for a bigger radon fan? I believe my basement is 2500 sq ft. via /r/DIY https://ift.tt/2JgxY37
