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Home Improvement, Design, and Decorating
Reply to "New HVAC increased radon levels?"
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[quote=Anonymous]So this is a new one for this HVAC contractor but as others have suggested its certainly plausible that a system could create a negative pressure environment in the basement that could increase measured radon. That being said it would have to be a perfect storm of a very tight home, poor duct design, and an oversized and/or misconfigured system. What doesn't make sense to me is that the old system didn't cause this issue. The new Infinity VS system should be running longer but at a lower capacity and reduced airflow compared to the old system. Theoretically it should be creating less negative pressure in the basement compared to the old system; everything being equal. That fact this is happening and that they felt the need to add additional return air from the basement leads me to suspect the system is overly upsized. Reconfiguring the system's airflow settings should correct the situation. Whether the existing duct system will adequately heat and cool could be a whole other issue. Personally when this gets sorted out I would spent the money to get a remediation system installed either way. [/quote]
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