While not recommended, depending on the age and building configuration, it is possible that someone who has the appropriate skills and building knowledge can successfully lower their radon levels. That being said, there are many things to consider when designing and installing a system properly. The sub-slab material type will affect the pressure field extension (how far the fan can effectively draw from a given suction point) requiring more than one suction point in many homes. Crawl spaces, slab-on-grade areas for garages, patios, and porches are also radon sources with higher radon levels. The fan location and points of discharge are also regulated by the radon mitigation standard to prevent radon gas from entering back into the home.