Do Active Soil Depressurization Systems Require Regular Maintenance?

Do Active Soil Depressurization Systems Require Regular Maintenance? One of the most popular methods is known as Active Soil Depressurization (ASD), where a pipe is installed in the foundation floor slab of a home, through which a fan draws in radon-containing soil gas from beneath the home, expelling it outdoors (see Figure 1). How long