ELUTENG Mini USB Fan 40mm

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.

This really is a great product. Especially for the price. It’s a breeze compared to my old setup. Before I came across this gem, I’d been using just a regular old computer fan that I’d yanked from Dianne’s computer and an old camcorder battery I kept from my days working on adult films. It didn’t have any fancy settings or any of this newfangled protection they put into everything nowadays. It was either on or off and if I grabbed it while it was running, I nicked my fingers and that’s just how it was, until I found this product. It’s a little bigger than my old fan, so it fits snuggly into my back pocket, with plenty of cord to reach my new power bank I keep in my other pocket or my satchel, and it keeps the air moving. The HML switch is small enough to fit through my belt loops and with some planning, the cable can easily be strung through my belt loops keeping the switch conveniently placed at my side for easy access. Stringing it through my belt loops also keeps excess cord from being snagged by my flailing arms or those damn doorknobs Dianne insisted we get when we remodeled our home last year. I couldn’t believe how great the HML controller is for quick and easy control of the fan speed. The different speeds are great for a variety of cases. The lowest speed is great for just keeping the air flowing and keeping my pants cool and dry while the highest setting is great for quickly dispersing increasingly pungent smells. And it’s so quiet. Even on the highest setting, the fan remains silent. No more awkward “what’s that humming noise?” questions from people I got with my old fan. If it weren’t for the constant cool breeze, I’d forget it was even there. The grates on both sides are a MUST-HAVE. I thought I would just take them off, but they really do provide great protection on both sides of the fan. I no longer nick my fingers when I remove the fan from my pocket when I forget to turn it off. I haven’t had to put a new bandaid on my finger in days. And no more awkward fidgeting trying to readjust the fan in the heat of the moment after it’s become snagged on the pocket lining. My old fan constantly got caught up on my pocket lining. But the grate keeps the lining away from the fan blades no matter what. And the grate is strudy, too. Only the one time have I managed to depress it far enough that it came into contact with the fan. But, that was only because I accidentally sat down on the metal bleachers at Mathew’s baseball game with it still running in my pocket. But, even then, the grate bounced right back and didn’t bend at all. It’s still as straight as a rabbit’s ear on the Fourth of July. I’d recommend this product to anyone looking for a pocket fan. I like it so much, I’ve already purchased one for work, one to keep in my pickup, one to keep in Dianne’s car, and even one for David because I know he’ll just love it. There’s nothing better than having a cool crevasse in the heat of summer, being able to disperse those wrank bouts of gas after Dianne’s world famous enchiladas, and warm apple pie. Just the other day, Dianne and I were grocery shopping. I let one slip in the produce section down there at the Walmarts. I flipped the switch to high and in a matter of seconds, it was a row over. The poor girl stacking the carrots started gagging because she thought some of her produce had gone bad. But no one looked at me for a change.

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

The internal fan stopped working on my GE Opal ice maker. Rather than replacing the original fan, I decided to give this a try by attaching it to the outside with magnets. It has been running 24/7 for a year today (11/11/25) and still going strong! I haven’t evening cleaned the dust off of it and it just keeps spinning along. Pleasantly surprised by the quality. Works perfectly for the ice maker on the medium speed.

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

Worked perfectly for drawing hot air out of home theater cabinet (30”w x 15”h x18”d) that contained AV receiver,Blu-ray player,ethernet switch and Tablo device. Drilled multiple 3/16” holes in bottom of cabinet, have a centrifugal blower fan drawing cool ,fresh air in from bottom of cabinet through these holes and used this fan to draw this induced cabinet air out. Interior cabinet air is drastically cooler now. Both work fine powered by the 5v usb outleton front of AV receiver. Fans silently operate only when reciever is powered on, shuts when the receiver is turned off.

The fan is decent enough, through I didn't need three speeds. Even at the highest speed, it's fairly quiet. That it moves only 56 CFM at best is why it's quiet. Very little turbulence is involved in the fan's operation. The thing is, I didn't buy this for a computer or for cooling. I needed a USB fan to be the "suction" part of a UV gnat trap. I was seriously concerned that the fan itself wasn't powerful enough to suck in the gnats attracted by the nearby UV light. I compensated for that by decreasing the size of the entrance, so that air is more quickly pulled in by the fan. In testing, I put it out, with fresh passive gnat traps, and comparing the two. The fresh passive gnat traps had a few stuck to them . The inside of the gnat trap looks like complete gnat carnage. So as long as one has a decent idea of air-flow mechanics, the fan works quite well to suck in and trap gnats. As a cooling device for a hot item, it does actually do that job, too. The UV light, when left on (as it needs to be) does get very hot. But with it positioned over the hole through which the air is drawn, it stays nice and cool, but it's VERY close to the fan itself (within about 2 inches from the intake), so I'd be hesitant to use a low CFM fan on a vital component in need of cooling without some real clear air-flow dynamics going on. I'm pleased that it worked for me. I'm even ordering another one to make another gnat trap. But I would get a much higher CFM fan for anything larger than a tiny UV light. The 120 fans I have in my computer have over 140 CFM (more than two and a half times the air flow of this) and they barely keep up on warm days. So consider carefully what you're trying to do with this fan, and your own skills at airflow dynamics, before you buy. UPDATE 09/03/2022: I purchased a second fan to make a second gnat trap, and found that the "silent" fan I originally got wasn't a repeat experience. The second fan has a grinding sound that tells me the bearings are already messed up. It has a surging sound that goes from almost silent to rather loud, to almost silent again, and it's really annoying in a quiet environment. For the lack of consistency in quality, I'm removing a star, going from 4 to 3. And if the bearing goes and I have to replace the fan, that will be a huge pain, because it's literally built into into the middle stage of the trap (the bottom is the vent and sticky trap, the top is an air vortex that increases the suction power of the fan). That means I'd have to rebuild the whole stage again around the new fan - it's not designed to be replaced easily. If it was going to make this much noise, I'd expect it to move a lot more air - and it doesn't. I'm removing a star (from 4 to 3) for the noise it makes. I'll revisit this review for a serious down-grade in the stars given if the bearing gives out, or the noise increases, in anything less than 50,000 hours of operation.

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.