radon mitigation system 5

https://record-wiki.win/index.php/Understanding_High_Radon_in_Pennsylvania:_What_Homeowners_in_York_PA_Need_to_Know

Our radon mitigation system uses a vent fan with a sealed pipe running from the sub-slab gravel layer up through the roof, so gas never enters the living space. We sealed the foundation cracks and installed a manometer to watch the pressure difference, which drops radon levels from over 10 pCi/L to below 0.5 pCi/L in the basement. It runs quietly on a small amount of electricity, and the gauge makes it simple to check that everything's working right.