Any house with a concrete slab floor on the lowest level (basement or first floor)
where the primary radon source is below the house (virtually all houses with elevated
PRINCIPLE OF OPERATION
A negative pressure field is created below the slab preventing the entry of radon
gas into the house.
One or more penetrations are made in the slab and a small pit is created beneath
each penetration. PVC duct pipe
is connected to the slab penetration(s) and is routed to the suction side of the Fan. PVC
pipe is then connected to the pressure side of the fan and is routed up the side wall of the house to
discharge the Radon Gas safely above the roofline. A weatherproof electrical connection
with a switch is provided for the fan.
active soil depressurization and block wall depressurization radon mitigation systems
shall include a mechanism to monitor system performance and warn of system failure. The
mechanism shall be simple to read or interpret and be located where it is easily seen or
heard by building occupants and protected from damage or destruction.
radon mitigation system monitors, such as manometer
type pressure gauges, shall be clearly marked to indicate the range or zone of pressure
readings that existed when the system was initially activated.