In high‑risk zones, when is passive radon stack enough; what are quiet active fan specs homeowners accept?
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Okay, if radon levels stay low all year, a passive stack is all you need. But if you’re in an area where radon spikes during certain seasons, go for an active fan. Homeowners prefer the quiet ones that are less than 2 sones, move 50–100 cfm, and use about 20–50 watts. Put them outside or in the attic on some pads so they don’t make noise inside the house.