Suction points are typically 4-6 inch holes cored through the slab near an outside wall. Soil is loosened and vacuumed out. Suction point is sealed to the core.
Aor a home that has a slab-on-grade or a basement, suction through a hole in the slab is applied. Radon-laden soil gas is drawn laterally through the rock and soil beneath the slab and then exhausted outside. The more permeable the soil, the better the system works.
If the soil is very tightly compacted or if there are obstructions under the slabs, such as intermediate foundations, more than one suction point may be needed. If multiple suction points are needed, they can generally be connected to a single depressurization fan.
SUCTION POINT FOR SLABS AND BASEMENTS
Hole cut through slab.
Pit dug out.
PVC pipe connected to hole.
Pipe routed to fan.
May require more than one suction point if soil is highly compacted or intermediate grade beams exist.