Unveiling the Mystery of the “U Tube” Gauge in Your Radon Mitigation System

Pressure gauge aka U TUBE on radon mitigation system

Have you ever looked at your radon mitigation system, and wondered what is this “U tube” measuring?

Many homeowners erroneously believe that the gauge for a radon system is measuring the radon levels in the tube. This can’t be further from the truth.

This device is called a Manometer. The Oxford English Dictionary defines it this way:

“an instrument for measuring the pressure acting on a column of fluid, especially one with a U-shaped tube of liquid in which a difference in the pressures acting in the two arms of the tube causes the liquid to reach different heights in the two arms.”

Due to the misinformation, the American Association of Radon Scientists and Technologists – AARST, requires ALL active systems to be clearly labeled in an area easily accessible, to be considered Compliant with ANSI-AARST standards of installation.

The label must include wording explaining the device’s purpose, how to read it, and what to do if it fails, along with the installer’s information (name, phone number, certification #), date of installation, and, in particular, the initial pressure in the system.

Other examples of gauges that can be found in a radon mitigation system. These are usually found in commercial applications or when the system requires considerable pressure.

Check the gauge for radon mitigation system seasonally to ensure it is operational. Ideally the gauge will show uneven liquid. The fan is not working and will need to be restarted when the liquid is even -see picture below -.

How to check gauge for radon mitigation system?

Do not attempt to power a fan that has unsafe wiring. When in doubt, contact our office, and we will help you find certified radon mitigation professional to help you with this task. When choosing a professional, look for those that are also affiliated with AARST. The more affiliations a professional has, the more guarantees you can have that they stand strong in their knowledge, take their job seriously and keep your best interest in mind while performing their work. Along with added Code of Ethics and quality controls to ensure only the highest quality professionals are included.

Remember to test for radon every 2 years, especially if a radon system is present!

Radon test device with 2 yellow chairs, palm tree and large window in the background. In white words - Test For Radon Every 2 Years

Daisy Rezende owner of Smart Home Inspects and Smart Home Radon

Deise (daisy) Rezende

Owner of Smart Home Inspects and Smart Home Radon

Deise Rezende is the owner of Smart Home Inspects and Smart Home Radon, with a passion for household management and indoor air quality. As the current president of the AARST MD Chapter, she is dedicated to raising awareness about radon gas and promoting safe living environments. Deise holds certifications in radon testing, soil gas mitigation system inspection, and mold inspection. She is a fellow at the National Radon Speakers Bureau and a member of the IAQA. With a belief in continuous learning, Deise strives to expand her knowledge in the field. Her expertise and commitment to excellence make her a trusted authority in home management and indoor air quality.

Favorite quote: “The more you learn, the less you know.” Albert Einstein

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