Check that the fan is operating:
Occasionally check the systems manometer tubing to confirm that the fan is creating a vacuum under the slab. The manometer is a pressure gauge measuring the inverse relationship between suction and air flow. It is not a measure of Radon concentration.
Check to make sure that there is power to the fan: switches are on, breakers are on. If both columns on the manometer are level, equaling zero, the fan is no longer working.
- Check the clear hose at the top of the gauge (is it un-connected, crimped or clogged)
Retest your home every two years:
The EPA recommends that you retest your home every two years.
For internal systems only:
Occasionally review the flashing gasket and sealant around the roof penetration. Plumbing boots do not last as long as most roofing shingles.