There are several techniques that can be used to reduce radon in the air

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Design and Installation of Radon Mitigation Systems in Residential structures

There are several techniques that can be used to reduce radon in the air.

The most common system installed is known as a "sub-slab depressurization system". It is very effective. A vacuum is created under the basement floor or slab and captures the radon before it enters the building space.

The fan characteristics, placement of suction points, and quantity of vacuum pits are unique to each property and designed accordingly.

Active Soil Depressurization: ASD

ASD reduces radon entry by mechanically creating a suction beneath the foundation which is stronger than the vacuum applied to the soil by the building. (Must remove air from beneath home at a faster rate than what air is supplied to it.)
ASD collects radon prior to entry and exhausts it to a safe location outside of the building.
Its application depends upon the foundation type, not radon concentrations.

ASD type of systems.

Sub-Slad Depressurization (ASD) system

This active sub-slab depressurization (ASD) system is by far the most common type of radon gas reduction system installed today. A hole is cut in the basement slab, a cavity is excavated beneath the slab, and 3" or 4" diameter PVC pipe is run up from the slab, out the basement wall, and connects with an exterior mounted exhaust fan. From the fan, an exhaust pipe runs up at least 10 feet above ground level, and 10 feet from any windows.

Submembrane Depressurization (SMD) system

SMD Air extracted from beneath a well sealed sheet of plastic (High density polyethylene sheet) laid on earthen areas such as crawlspaces. The air is exhausted from crawl space before radon in crawl space can enter living space above by installing a ventilation system through polymer sheeting in crawl space, up through interior or exterior of house/building to radon fan vented above the roofline.

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Before installing a Radon System------
After installing a Radon system--------

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