Reliable Rolla Radon Mitigation

Selecting the correct replacement fan requires knowing your pipe diameter - typically 3 or 4 inches - as well as the airflow and static pressure requirements of your specific system. A diagnostic test performed with a manometer can help determine whether your system needs a high-flow or high-suction fan based on your soil conditions and sub-slab communication. Simply matching the brand and model number of the old fan is a reasonable starting point, but upgrading to a higher-performance fan may be warranted if the original system underperformed. When in doubt, consult a certified radon contractor who can evaluate the system and recommend the most appropriate fan for your home.

A fan that is running but failing to reduce radon levels suggests the system is not generating adequate negative pressure beneath the foundation, which can have several causes. The fan may have lost suction capacity due to motor wear, or it may be undersized for your specific soil conditions and foundation design. New foundation cracks, open sump pits, or changes to the home's structure can also create pathways for radon to bypass the system entirely. A certified contractor should perform a pressure diagnostic and sub-slab evaluation to identify the specific cause before recommending a solution.

Yes, radon fans are designed and built to operate 24 hours a day, 7 days a week, 365 days a year. Unlike HVAC systems that cycle on and off, radon fans must maintain constant negative pressure beneath the foundation to prevent radon from entering the home. Turning the fan off, even temporarily, allows radon to begin accumulating almost immediately, depending on local soil conditions and radon source concentration. If you are concerned about energy costs, rest assured that most radon fans are very energy-efficient and cost only a few dollars per month to operate.