4 Pack USB Brushless Cooling Fan 40mm High Performance DC 5V Speed 4200 RPM for Small Appliances Series Replacement For Desktop

I use this with a mini Linux-based computer (about 4"x4"x1/2". I used a very small piece of double-sided tape to attach it to the hottest section of the computer. I did not cover any computer cooling fins. The fan immediately brought down the temperature and continued to do so all day and night. It does make some noise, but it is no big deal. And if the fan ever gives out, I have three more as backups!

I use these to cool off cable modems, routers and TV electronics in enclosed spaces. Quiet and just enough airflow!!

I use this product as a cooler for a home made cloning unit. During the pandemic time was something we all had so I did research and decided I could build a cloner cheaper then what they go for on Amazon. The units are installed on the ends of my cloners dome and inside the dome I have a separate container holding water and the bubblers to feed the cuttings. The fans keep the water cooler than the ambient temp inside the cloners dome that I installed two strip led grow lights, and keep a supply of fresh air circulating. I know they say do not put in water or in humid areas but they work really well and in the event one stops working the fans are inexpensive and easily replaceable in my situation. The fans keep the water 2-5 degrees cooler then the ambient temp depending on conditions (day night winter summer) noise not really an issue for me since I have several other pumps and fans running it so don't bother me. In the end I really saved a bit of money but the first one I built took way more time than I wanted. Also my unit is half the size of some of the cloners so I saved some space. In a legal cannabis growing state where 12 plants is the limit you don't need a cloner with 36 spots. So for do it yourself projects these little fans have literally hundreds of uses not just for cpu or 3d printers.

Bought to enhance the cooling of a 27" 2015 iMac. Removed the ram cover and placed a fan for additional air circulation. A bit noisy but it seems to do the job. I use it primarily when playing games so the sound isn't an issue and I can easily unplug the generously long usb power cord when I'm using the iMac for regular tasks. Good value for the money.

Excellent product! A great addition to my collection!!

Just needed to Jimmy rig a fan for my laptop case and it moves the air I need. It was smaller than I expected but it’s quiet and light weight.

I got these little fans because currently my computer tower only has a single exhaust in the back, but it has a grate on the bottom front of the case, but no real way other than negative pressure to pull the air into it. So I figured I could get these, wire them up, and set them to a switch so they could just pull the cooler air into the bottom of the case. It would circulate through and be pushed out by my exhaust fan. And while they do do that, and it does work well and helps to cool my computer tower, they are very loud. Loud enough that when I stream, I'm unable to really use them because my microphone will pick them up more so than it even picks up my air conditioner. That is only 20 feet away from me. So while they work, and they are fairly powerful for their size, they are by no means quiet.

Easily worth the money. They are easy to set up, easy to connect, relatively quiet, and easily keep my SSD cool. I haven’t had any issues with them, and don’t see any issues coming up any time soon. Highly recommend