A passive radon mitigation system is typically installed when a home is being constructed. A passive contains two components:
Passive system relies on natural pressure differentials and air currents to eliminate radon from the home.
Sometimes when a home is being built, the building company will install a passive system without ever testing the home for radon.
This can be a problem because passive radon systems do not bring extremely high levels of radon below the EPA recommended 4.0. Many home buyers do not realize this when purchasing a home with a passive system.
An active radon mitigation system is installed when the home contains elevated levels of radon. It called active because a fan is always pulling radon from beneath the home therefore it doesn't have the opportunity to enter. This is also called sub-slab depressurization method.
Active system has 4 components:
Theres several ways an Active system can be installed depending on the layout of the home. The average radon mitigation system can be installed for under $1500.