Nalle 120MM Quiet Cooling Single Fan System with Power Adapter and Speed Control for Home Theater AV Cabinets Server Cabinet Greenhouse Cooling 6.3 * 6.3" Front-Panel

Exactly as expected works great

I purchased this to use when I constructed a small cooling box to sit on top of my SolarEdge inverter. Whe Summer temperatures reach triple digits, the heat sink on the back side cannot keep up with heat dissipation and the inverter will shut down until it cools. So far, this has eliminated the issue and kept the inverter much cooler. I am hoping that this will also extend the longevity of the electronics inside over the long run.

The fans move a reasonable amount of air, but can get pretty noisy when cranked up high.

Does exactly what it should do; reasonably quiet and the variable speed is most helpful.

I intended to use this as a duct booster - to increase the airflow to a room, but it's not quiet - in fact it's too noisy for this purpose.It's very like leaving a bathroom fan on all the time - same level of noise.

Works perfect and fits my shed vent. Was easy install

It was exactly what I needed, thank you