Used two of the low speed versions on the fridge fins in a Norcold RV fridge, with alligator clips in the mounting holes.
Low 12v power draw, move plenty of air, and are very quiet.

I am using this for cooling a self built solar generator. I have two stackable tool chests with wheels, and have two 12V batteries, AC charger, solar charge controller and a 1500W pure sine wave inverter installed in these chests. All of these components generate heat when in operation. This fan, in conjunction with two other fans I bought from Cooler Guys, are working flawlessly. They move lots of air, and they do it quietly. Cooler Guys also sells a fan controller that brings it all together.

I am super happy with the performance and quiet operation of this fan. Unfortunately I cannot take advantage of the speed control. It is still a great value for the price and I give it 5 stars.

This fan keeps my entertainment center nice and cool and works great with the Cooler Guys programmable thermostat controller. This single fan on top of my audio amplifier is so quiet that you don't even hear it run. What a difference with this DC fan compared with my older and less reliable 120V AC fan. The Cooler Guys questioned me about my application and provided the best solution that beats what I had before.

2nd dealing with coolerguys they are great
and helpful

Bought these as recommended by the cooler guys. Worked great. I used these in a greenhouse to move air around the plants. I placed one every 3 feet 12 inches above the plants. Very low power consumption and extremely quiet.