AC Infinity MULTIFAN S4, Quiet 140mm USB Fan, UL-Certified for Receiver DVR PlayStation Xbox Computer Cabinet Cooling

I have a passively-cooled mini-PC firewall that got extraordinarily hot. The dimensions of this fan were a perfect match to sit on top of the heat sink blades on the top of the case. The USB power makes it simple to plug it and forget about it. The fan is completely silent and made a huge difference in temperatures. I have been running it 24/7 for a year and a half now without any issues. Highly recommended!

I had this thing for a while now, and I first got it with and for my Xbox series s back in 2020, just to wick the heat away, it’s been on for the better part of 5 years, looks dusty and nasty but still works fine, and still wicks the heat from the Xbox to this day. It’s quiet and moves decent air for that sound level, you could put it on high, but for my Xbox, the low setting is more than enough. Just a good quality fan…

Im writing this review during a very HOT unusual few June weeks in Minnesota, its been over 90 for almost 2 weeks now, I have a full size 42U server rack for my home lab, it has a big hole on top that nobody's exhaust fans fit, 21 x 5.5, but the 140mm measurements of this fan is just big enough that I can sit about 4 of them on top of the racks hole. I work in Tech Recycling, so I see what happens to most tech equipment when its removed from service, its rare to see AC Infinity products, I rescued a old AC Infinity Controller they don't appear to sell anymore, but its similar to the one they sell now, and rescued a 2U Rackmount 4 fan with controller unit, I was amazed how quiet the rack mount fan unit was even after many years of use, the LCD controller is a bit hard to read, but other then that it works fine. So I needed some USB fans to plug into the other controller I rescued, I was concerned there was only 2 USB ports, which is the same as new model they currently sell, but when these fans arrived, I saw a lovely daisy chain USB connector, apparently you can have up to 4 of these on 1 of the USB controller ports so those 2 ports give you maybe 8 fans , I don't need that much, but its a nice feature, I plugged these in to the old controller set it on AUTO and away they go. The controller appears to have Low/Med/High setting but these fans also have a 4 way switch on the cord which seems to be 1 notch higher then whats available on the controller, I have them maxed, very light hum, not much more then my laptop fans on a hot day. Compared to others, I have rescued hardwired plug and run fans with no thermostat, that sound like a bunch of servers running, so these are by far the quietest ive heard (almost can't tell they are running), Now that I know they daisy chain, I bought 2 more, with 4 of these at about $15 each vs $300-400 exhaust fans that are usually 120mm, they sell for most racks this is a great deal and larger.Perfect product, not sure how strong they are? they are not as FAT/DEEP as some Ive seen at work, its very hot, my rack runs about 3-4 degrees hotter then the room its in, so even with the fans they are having a hard time cooling it down, but air circulation is always good. its hard to get cool when the room itself is hot upper 80s, and rack is maintaining lower 90s.Only thing I would add to this product,RGB colors would be nice for those of us that like adding colors to our loved computers, but probably wastes electricity and reduces power so maybe its better they don't have color lights. (only if it don't sacrifice cooling power)CLIPS, since Im buying 4 of these to fill that big 5.5 x21 inch hole in my rack that normally a bunch of wires would go through, but in my home lab all wires go down, Im using that hole as a exhaust for the heat to exit up to the ceiling, these cool rubber feet are nice, but it would be nice to clip these together with some kind of clip so instead of 4 loose fans its 1 big fan. The feet are good, but since I have 3 cats that can jump on top of the rack it would be nice to link these fans together with some kind of bracket or clip just in case, not too worried about it, but it would be a nice modular feature.Lucky for me its only hot in Minnesota 3 months a year, so most the year these fans won't have to work hard, but they are running 24/7 now in a near 90 degree room. These would be great for quiet rooms, chances are your normal household fan is louder. Love the product, both the old ones I rescued that were not quite ready to be recycled yet, and these new fans.

Using the fan with fan holder for my work truck. Fan uses USB for power and is very quiet, wished it moved a little more air but does its job great. Real test will be longevity in a hot truck in summer. Would buy again

I have a lot of these because they’re so great for cooling my technology, whether it be for charging or just mini appliances. It’s great solution for over heating items. The fact that it’s usb powered is also great

Excellent for my Router when it get hot in summer months.

I own two of those fans now and use them to cool my mini PCs, which are passively cooled by default. I put them on top of the chassis (which has cooling fins) and have them powered through a USB port from that PC. If you need to power them from an AC outlet, you may need to obtain a USB-A power adapter.As nice touch is that the unit comes with a switch with 3 speed settings (in addition to off), so you can adjust the speed to your needs. I run them on "M" (medium) and they brought down the idle temperature of my OPNsense router (running on a Protectli VP2420) by 8 degrees Centigrade (14 Fahrenheit). And I don't hear the fans at all on that setting, unless I come very close to my router.I also appreciate the little touches like the rubber feet, which avoid scratching your gear.All in all a very well designed product and if I ever need to cool another device with a fan, this will be my go-to product.

Years ago I foolishly bought an all-in-one pc because it was great for drawing, but I wasn't thinking about my equal love for gaming and all-in-ones really...aren't built for that (oops). My pc gets super hot (like scalding to the touch) whenever I play games on it, and I would always worry about it over-heating.Then I found this fan, and I am impressed! It's super quiet for a fan (which is a huge plus because I hate noise), and my pc is now only luke-warm when I play a game. It doesn't seem like it's very powerful because you can't feel very much air from it, but it is in fact cooling my device, so I'm happy! This works as intended- it's a great little fan for electronics (not for your face; it will feel weak if that's what you bought it for. I read some of the lower reviews...just sayin'.)