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I bought this for a couple potential scenarios. I have several fanless devices (switches, firewalls, etc.) that act up from time to time. So I think an external fan run off USB would be useful. The other is a mini computer with a custom fan that is no longer made by the manufacturer of fans. This allows me to put the fan external to the device and force air through it.
The fan runs quiet on slow speed. In a quiet office/basement, I can hear the fan running (I listen for any new slight noise in case it indicates a problem). I'll stop and listen intently to try to find the noise and then realize it is just the fan. The rubber pads keep it off the surface enough to get sufficient airflow and do not vibrate the device. Works really well. It works great as a table piece in our home.