ELUTENG 40mm USB Fan with 3 Speed Control USB Ventilator 5V Max 5300RPM High Flow VR Cooling Fan Compatible for Receiver DVR Playstation Xbox Computer Cabinet Cooling

For a tiny fan next to the raspberry pi just pulling air through any of the openings that the raspberry price it's in reduces the temperature 15 to 20° Fahrenheit especially when the fan is on high speed but it is multiple speeds and that is entirely up to you and how you want to use them

My HP Pavilion AIO desktop tends to run hotter than I like, so I mounted a ELTENG 4 mm USB Fan over the warmest vents on the top of my PC's case, as a simple expedient, to limit my heating issues. It works and provides effective cooling with the fan continuously running on its LOW setting. ELTENG has given me an effective remedy to a bothersome problem at a great price. The fan is a quality, well made, product and I highly recommend it as an economical fix for similar cooling problems. NOTE: Mount the fan so that is blowing OUT so that it draws cool air through the bottom vents on the PC's case and "exhales" the warm air through the TOP of the case.

the fan is well made and the three speed switch is a big plus. But there is no getting around the fan is very small and to move air it must work much harder than a bigger diameter fan. For this reason it causes noise. I am using it behind a tv to cool a roku box. There is USB power behind the tv so it is a natural choice. The noise isn't much but in a quiet room late in the evening you will notice the fan noise but it is unlikely to bother you. I have left it on (It turns off with the tv) and the Roku never gets hot (Two old ones did and failed hence the fan.) So if you have a USB port and need to cool a poorly designed device such as a modem, Wifi router, or a TV device then this is a good candidate because of the power source and the size. It has solved my problem, now only if Roku has hired better engineers ... then lol

I was just about to finish my previous review of this fan when, in mid sentence, Amazon thanked me for the review and said that after it was reviewed that it'd be posted. When, they wouldn't say. I am going to try finishing that review by posting this one since, so they told me, it is impossible for them to send it back to me for finishing. This information only took about 45 minutes to get while I hung on the phone listening to their mind-numbing music. Maybe they were hoping that I'd give up and leave. So, I was talking about the mounting screws for this fan. It turned out that they are 1/2" inches long, self tapping screws and the holes will have to be drilled out to fit even a (small) 4-40 machine screw, probably about 1" long. This will reach through the fan body with about a half an inch left to go into whatever it is that you want to mount it on. I also mentioned that this fan is meant for applications that don't require a lot of air flow. The specs indicate that the amount of air it can move is 4.4 cubic feet per minute. For those using it to ventilate a terrarium, for example, lets use one that is 2.5 feet wide, 1.5 deep, and 1.5 tall. Although this is a weird one size-wise, it nontheless would hold about 5.6 cubic feet of air. This is a good application for this fan as it will almost totally replace the tank's air every minute. Let it run for 2 minutes and it will replace more than a tank of air by a wide margin. And a final comment about the fan noise, or rather the lack of it. One reviewer reported that it made a terrific racket, and so it must have been a defective one because the ones I'm using can't be heard unless you get up really, really close. When it is shut off, there is less noise, a gentle "whoshing" sort of thing as it costs to a stop. When it is powered back up, there is an obvious noise increase from the motor itself, but still undetectable unless you are up close and LISTENING for it. It'd be no bother at all in a bedroom at night. I gave this fan high marks because it quietly goes about its business of moving air. I ought to know as a long time ago, I was an engineer working on this very problem. Designing a larger fan (10 inches in diameter) to make a minimal amount of noise is not child's play.

My DirecTV receiver was issuing over-temp alarms. The receiver was mounted to the top of my wall-mount TV that resides in a wall niche. I needed an easy fix that didn't require reconfiguring my installation. I set this well-made little fan on the receiver shelf so it blows in through the rear receiver vent. I plugged the fan into the DirecTV USB port so the fan only runs when the receiver runs. The fan is essentially silent and it dropped my DirecTV receiver temperature over 20 degrees with the fan only running on the medium setting!

The fan worked correctly for a few months. It does move a fair quantity of air, but it's rather noisy for the size. The fan speed switch no longer works as ut should. It runs at the same speed, no matter which setting you choose: L, M, or H. It also runs when the switch set to "OFF". I don't consider that good "feature." I have to unplug the cable to stop it. I haven't decided whether to take the switch apart to check it, or just toss the whole thing.

On high the fan doesn’t haven’t enough power to blow a tissue, to move it at all… right on top of it. Cmon. There is no airflow at all. This is worthless. I have a half dozen usb fans over the years. They all blow at least some air. This thing is useless.

I use two for a Poison Dart Frog enclosure, so far I’m impressed. Pretty quiet, decent airflow (for my application though) and price.

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Works good

Bought this to work in a portable freezer, and to my surprise and delight, has been doing really well

Works well

This tiny USB fan works very well for me. I use it to cool my XGSPON SFP, and despite its small footprint, it handles the job reliably. The airflow is modest but consistent, and it’s quiet enough not to be distracting. It’s not a powerhouse, but for targeted cooling in tight spaces, it’s a smart little tool. Definitely exceeded my expectations.