Protect your health. Test your home.



Radon Fans

St. Louis Radon uses Radon Away fans. The highest quality fan in the industry.

  • Energy Efficient
  • Designed to allow water to filter through exterior fan housing
  • Five year warranty on performance
  • No air leakage
radon mitigation fan

Radon fans run continuously and while NRPP requirements call for a disconnect switch, the fans should never be turned off. Radon concentrations will return to elevated levels in just a few short hours.

We use a lock friendly switch box for external radon mitigations. Especially important if you have kids that may play with the switch box and could turn off the fan.

Fan selection is a balance between the vacuum pressure needed, based upon sub-slab conditions, and air volume needed which is based upon cavity sizes and tightness of the slab.

A larger fan is not always a better choice. Oversized fans can bring more noise, excess energy loss and problems with other building systems.

Careful attention to system design is much more critical for homes that may require larger fan systems. Likewise for older homes on tight soil that may require a fan with high suction capacity.

If the radon mitigation system needs to move large volumes of air, the pipe size is more critical than the strength of the fan. 3" pipe moves up to 100 cfm while 4" pipe moves up to 200 cfm.

The radon fan must be placed in unlivable space due to the possibility of an exhaust leak. The Radon fan must be outside or in an attic that does not have livable space above it. It can be in a garage that has exposed rafters/trusses.


The first step to help ensure the safety of you and your family’s health and safety is to have your home tested for radon. At St. Louis Radon, our professional testers deploy the latest in computerized electronic real-time radon monitoring technology to provide you with a comprehensive report, including a complete visual graph of radon level data points as recorded over a 48-hour sampling period.

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If testing indicates levels of radon that require action, our team of engineers and technicians will design and install a custom radon mitigation system to safely and effectively redirect radon and other soil gasses out of your home. We also take additional measures to seal and close other possible breaches in the foundation that could let soil gasses into the through cracks or drain tiles systems.

Learn More About Mitigation

New Construction

With new home construction projects, it is crucial to determine the level of radon that may be present in the soil before the home is built. It’s also critical to have the new home retested for potential radon concentrations immediately following occupancy. We also highly recommend installing an Active Dampness Control System (ADC) with every new build.

Learn More About New Construction