
20 year old radon system still working adequately?
I peeked at my 20 year old radon system gauge in the crawl space. While the negative pressure balance seems okay, the upper measure is low off the scale. Does that matter; does that mean it is still working, but only working weakly?
I will do a air test next. It's been a while, but I've tested low every time. Most recent was probably a couple/few years ago.