As an IT Admin for a small Transportation Company we have a large monitor set up so we can view all of our vehicles out on the road. After the remodel we wanted a better solution than using an older Dell PC which was using up precious desk space. We purchased an Intel W5 Pro with an Atom x5-z8350 & 2GB of Ram running Windows 10 Pro. As we just needed it to display a web browser we felt this solution which would free up space as well should do the job.

After a few months of 24/7 operation I noticed the fan was starting to fail and temps started to rise. Finding the actual replacement fan didn't seem to be an option due to how proprietary the little fan was. Looking for a USB powered alternative I stumbled across this, took off the case on the W5 and strapped it to the top.

Ugly? Sure, but as you can see adding the fan brought temps down from 70/80c to 36c!! With averaging around 55 or so with a moderate work load. As far as acoustics it's fairly silent on the lowest fan speed setting. I experimented with turning the speed up but didn't make that much of a difference. So keeping it on the lowest setting is best.

The monitor has a USB port where it pulls power and the nice thing is that it will go to sleep when the monitor does. It is not connected to the compute stick as I didn't want to stress the little device any further.

So... great little fan for 10 bucks. Moves a good amount of air, is quiet and has 3 speed settings. I highly recommend it.

OK the serious stuff. They provide a cooling solution for NVMe external enclosure heatsinks. Also they work other vented storage enclosures you can find on Amazon.com that lack active cooling. They work well as do all of the AC Infinity Cooling solutions. They are high quality compared to other choices. The fan impeller is quiet and you can adjust the speed for near silent running characteristics.

Test Images:
40mm AC Infinity fan unit set to High.
Raid Mini enclosure with two Seagate FireCuda 2 TB hardrives.
Acoustic emissions very close field measurement. Rating: Office environment and below normal conversation levels.
Second measurement-Relative Ambient sound levels about four feet away from test rig and two feet from four-120mm case fans. Rating-Quiet living room.

Differential Acoustic Results:17.3 db...of course who sits with their ear on the fan except people whom mounted their fans to eyeglass frames.

I think the inline stringing feature which allows you to chain additional fans together is just too cumbersome in this instance due to the weight of the fan itself. Instead it would be nice if this portion of cabling came terminated at each end so you could remove it and plug it back inline as needed. Also when using a USB Hub as a power source where the device that needs cooling is close, 8"-18" max inch's in lead length would work better than the wire bundling requirement with the current configuration.

I used these fans for a diy project and they worked perfect. Small quiet and durable.

The fans work perfectly, are good quality, and are silent. Some of the negative reviews indicate that these fan do not move much air. While that may be true compared to other similar fans, these usb fans are not intended to have a high CFM (cubic feet per minute-it is a measure of air flow volume) and their intended purpose is not high velocity. High CFM fans are loud and are not low voltage usb. However, the 2 fans together allow for increased cooling without noise. There are other products if you need high velocity. If you purchase the wrong tool for the job, it's not the manufacturer's fault that it did not work for the intended purpose. Additionally, AC infinity's customer service is extremely responsive and courteous. They responded to every inquiry, did it quickly, and resolved the issue in my favor. AC Infinity is located in CA.

I bought four of the 4" fans to squeeze into the rear slots in my entertainment cabinet. I suspected that I could use the silicone rubber feet to mount the fans, and it worked! The fans are held in place solely by the tight fit of the silicone washers against the edges of the cable cut-outs in the back of the cabinet.

Since they are tight, and the rear of the cabinets are thin wood, at their highest RPMs, the fans make noise louder than the Xbox One X in the cabinet. However, at the "Medium" settings, the fans are no louder than the game console, and at the "Low" settings, the fans in the game console are louder.

They really move a lot of air at the highest setting. I could feel quite warm air exiting the cabinet from the fans directly behind the Xbox One X, which vents heat out the rear of its housing. The other fans that were pulling air from mostly empty space were blowing out cool air.

You can daisy-chain these together, but the speed control seems to affects all the other fans downstream. I had four of these connected together, with only one of them plugged into USB power. When I set the fan plugged into power to Low, the fan at the end of the chain stopped. Presumably, the other fans slowed down.