ELUTENG 120mm Fan With 3 Speed 5V USB Powered Case Fan 1500PRM Gaming PC Portable Cooling Suitable for Tablet TV Receiver Router DVR Play Station Xbox Computer and More

I'm using this small fan to help stop mold from forming in our shower after use. I saw a YouTube video of this when researching how to best inhibit that mold growth in a shower. We were wiping down the walls and shower floor after use but still had those pesky areas where mold would develop. This guy used a small computer fan to circulate the air and I thought I would try it. It is very quiet so it doesn’t disturb us at all and it is certainly working as the floors are remaining clean after we cleaned the grout and started using it. So far, so good.

Worked out great for my application

The fan functions well and quiet. The only down side is hard to mount.

Great fan for all projects and pretty good on low noise levels.

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.

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.