ELUTENG Mini USB Fan 40mm

Its tiny but mighty, exactly what I expected and it works as intended.

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.

This lil fan is working great. Bought to keep hard-drive cool installed in my Eufy Homebase 3. The fan is held in place by 3-m bonding tape to the top of the Homebase over tge vents pulling hot air out to keep the hard-drive cool.

So far so good! Quiet like it says on the ad

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

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.

I bought two. One semi works very little air flow while the other I don’t feel a thing! Will not buy again or recommend

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

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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.