When I bought my house 5 years ago it had radon of 5, so the seller threw in money for remediation. That dropped it to 0.5. But it is noisy. My wife and neighbor don't seem to notice it, but I find it annoying.
My understanding is that the fans last about 5 years, so it doesn't owe me anything. If I replace it with a quieter fan with half the CFM, what results should I expect? When I turn the fan off, it goes from 0.5 to 5 in about a day. Turning the fan back on drops it to 0.5 in 3 days. The manometer on the exhaust pipe shows 1/2", for what that's worth.
The installer sealed the perimeter with caulk, but that doesn't seem to do anything because the reading without the pump on are the same as before any remediation. Would sealing the concrete floor do anything useful.
Thanks.