Radon is the 2nd leading cause of lung cancer because it is a derivative of Uranium. It changes molecular structure 3 times before it becomes a radon gas. The radon gas is lighter than air so it comes up through cracks and openings in the earth and slabs.
In testing, EPA has set an action level of 4.0 pCi/l. If the radon levels are 4.0 pCi/l or higher in the building, mitigation is recommended to help get rid of the radon gases.
Mitigation involves siphoning the radon gases out from underneath the slab or installed membrane before it has a chance to enter the home or work place.
A radon mitigation system in your home or business in no way affects the valve of the building. In fact, they are finding out that the overall indoor air quality has improved with mitigation systems because it also siphons out other contaminates before it reaches the living space.