GroundAir MGR is comprised of a fibrous core made with recycled polymer and heat-bonded to a recycled polyester filter fabric.
Standard Specification Chart:
GroundAir MGR is a flexible duct that allows ground air to flow within its 95% open interior structure. As Moisture, Soil Gases, and Radon (MGR) are driven from the ground they percolate up to the surface through the path of least resistance. Passive Soil Depressurization (PSD) systems provide a vent stack (3” or 4” PVC Pipe) that is drilled through the basement slab, extended through the heated space of the house or building and out through the roof. By following this path, MGR does not enter the interior living space on its way to the surface. These systems utilize the “stack effect” to depressurize the soil. It operates similar to a fireplace chimney. As hot smoke rises up the chimney, a draw is pulled on the room. This is more effective when air outside is colder than inside. Sometimes the “stack effect” provides enough draw that MGR does not enter the home. Other times, a fan is also required to provide additional “pull” on the system. These systems are known as Active Soil Depressurization (ASD) systems.
PSD and ASD systems rely on the bed of gravel under the basement slab to collect the MGR at the vent stack. The ground air may need to travel 30 feet through the gravel to reach the stack. If it cannot overcome the resistance to flow over this distance, energy needs to be added to the system in the form of a fan to prevent it from entering the home. Other times a footer or downturn may be present and flow is cut off to sections of the footprint. GroundAir MGR’s root-like layout provides low resistance pathways to collect MGR over long distances and under or around obstacles. It extends the pressure / vacuum field (pfe) from the vent stack and prevents the occurrence of vacuum “dead spots” behind footers or downturns.
This simple, yet effective system improves indoor air quality by ensuring MGR flows easily under the basement slab to the vent stack and safely out through the roof. These contaminants would otherwise enter the home, if it became the path of least resistance.
Click here to download>> GroundAir MGR Technical Data Sheet