05:46PM | 09/11/17
Member Since: 09/11/17
1 lifetime posts
I've got a vent pipe that ends about a inch below the lowest corner in my unfinished basement. It vents up and out the roof with no cap or anything. I don't see any fan or anything on it. I could install a Home Depot radon fan for $170 (, but is it even necessary? Or perhaps the air blowing over the top of the vent will be enough to venturi some flow out of my basement. Perhaps I should get a test kit to see if it's necessary. If that's the case, I'd like to test during a peak radon time, would that be a season of the year, or during/after heavy rains?


10:25AM | 09/13/17
It's best to test in closed home conditions with a short term charcoal test kit. This time of year is fine for testing.

It sounds like you have a passive radon system, which vents gas from beneath your foundation. If you have high radon levels, adding a fan will "activate" the system and will usually bring levels down significantly. Check out for information on these types of systems. Our company supplies contractors all over the US which build these. We have low-voltage fans available for DIY-ers as well.

The only way to know for sure if your system is installed or working properly is to contact a local certified mitigator. Check out AARST ( for mitigators near you.

--Brent, PDS
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