radon fan noise 3

https://radonfannotworkingway.publishlane.com/posts/when-your-radon-fan-stops-troubleshooting-a-radon-fan-not-working

That quiet hum from the basement might be the radon fan, blending into the background like a distant refrigerator. Some describe it as a soft vibration, others as a low drone that barely registers unless the house is perfectly silent. It's not loud or disruptive, but once you notice it, you might find yourself listening for it. The fan is always working, always pulling, never stopping. It's the kind of sound that becomes part of the home's white noise, easy to ignore until something changes.