Review on 🌀 AC Infinity MULTIFAN S4: Silent 140mm USB Fan, UL-Certified for Receiver, DVR, Playstation, Xbox, Computer Cabinet Cooling by Josh Andrews

I am writing this review during a very HOT unusual couple of weeks in Minnesota in June, it's been almost 2 weeks past 90 now, I have a 42U server rack in full size my home lab. , it has a big hole on the top where no exhaust fans fit, 21 x 5.5, but the dimensions of this 140mm fan are big enough that I could fit about 4 of them on top of the rack hole. I work for Tech Recycling, so I see what happens to most tech equipment when it's taken out of service. It's rare to see AC Infinity products. I salvaged an old AC Infinity controller that they no longer sell but it looks like the one they are selling now and saved a 2U rackmount 4 fan with controller box, I was amazed at how quiet the rackmount fan was even after years of use, the LCD controller is a little hard to read but otherwise works great. So I needed some USB fans to connect to another controller that I have saved. Apparently you can have up to 4 of these on one of the USB controller ports, so maybe those 2 ports give you 8 fans. I don't need that many but it's a nice feature, I hooked it up to an old set of controllers, this on AUTO and away we go. The controller seems to have Low/Med/High settings but these fans also have a 4 position cable switch which seems to be 1 notch higher than what is available on the controller, I have them on max, very light weight Hum, not much more than fans of my laptop on a hot day. Compared to others I've ditched myself for plug and run thermostatless hardware fans that sound like a bunch of running servers so these are by far the quietest I've heard (almost can't tell they work) . Now that I know it's Daisy Chain I've bought 2 more of them, 4 for about $15 each compared to $300-$400 for exhaust fans which are typically 120mm and for most racks are sold. This is a great offer and more. Perfect product, not sure how strong they are? They're not as FAT/DEEP as some I've seen at work, very hot, my rack gets about 3-4 degrees hotter than the room so even with fans they have a hard time cooling it, but airflow is always good. It's hard to cool down when the room itself is hot above 80 and the rack is below 90. The only thing I would add to this product, the RGB colors would be good for those of us who like to add color to our favorite computers, but probably wastes power and reduces performance, so maybe it's better if they don't have colored lights . (only if cooling performance is not sacrificed) CLAMPS as I buy 4 of these to fill the large 5.5" x 21" hole in my rack that a bundle of cables would normally go through, but in my home lab they all come Wire out I use this hole as an exhaust to get the heat up to the ceiling, those cool rubber feet are nice but it would be nice to connect them together with some sort of clip so instead of 4 separate fans there is one big fan. The legs are good but as I have 3 cats that can jump on the stand it would be nice to have these fans along with some sort of mount or clip just in case don't worry too much about it though it would be so pretty nice modular feature. Thankfully Minnesota is only hot 3 months of the year so these fans don't have to work hard most of the year, but now they're running 24/7 in a room that's about 90 degrees. This would be great for quiet rooms, chances are your regular household fan will be noisier. I love the product, both the old ones I've salvaged that weren't ready for recycling, and these new ventilators.