Burbling Sound from Active Radon Pipe

Active attic radon fan in place for a couple of years. Normally, can hear a little bit of air moving from gap between concrete slab & foundation wall. Steady, low… Active attic radon fan in place for a couple of years. Normally, can hear a little bit of air moving from gap between concrete slab & foundation wall. Steady, low…Read MoreGreenBuildingAdvisor