AC Infinity MULTIFAN S4, Ultra-Quiet 140mm USB Fan with Speed Controller

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.

My Onkyo model is known to die early, so I wanted to make sure that it doesn't get too hot in my new TV stand. I was very impressed with the quality of this fan, so I had to put it to some scientific test. I've been building my own PCs since a kid as a hobby, and this fan is much better quality than any computer fans I've come across (including the massive 200mm fan on top of Antec 900). It's also literally silent even on high setting when it's inside the cabinet. At first I thought the USB port on the receiver wouldn't power the fan and was debating whether to use an AC adapter to run it 24/7, but it turns out the receiver's USB port has a 10 second delay before it sends power after you turn it on. Make sure you are patient when you plug it in. Test setup: Onkyo HT-RC360 7.2 channel Receiver (5.1 setup) All Ch Stereo (5 channels) at 80% volume 4.8" clearance above the receiver (see photo) ivation wireless thermometer with 2 sensors placed directly on top of receiver ambient temperature - 75F After doing several tests with different variables, I realized playing songs made the temps fluctuate too much. Then I realized that without a source, turning up the volume on the receiver created high stable heat since the power wasn't being transferred to the speakers and it only relied on dissipation. Listed below are highest stable temps(F) for both sensors. Door open, no fan - 118/115 Door closed, no fan - 122/117 (protection circuit tripped at this temp and it shut down for a moment) Door closed, fan on low - 100/93 Door closed, fan on medium - 99/93 Door closed, fan on high - 99/93 As you can see, the temps get very hot without circulation, almost getting uncomfortable to touch by hand. With the cabinet door closed, I would not be able to watch movies at all since it's running dangerously close to overheat protection threshold even with the door open. The speed setting on the fan had almost no impact in my cabinet because of the limited holes that hot air can escape. The benefit will vary depending on each setup, but going from no circulation to even limited amount of circulation makes a large difference (just like the 386 that had heatsink with no fan running hotter than 486DX with a fan). This fan is exactly what I needed/wanted, and I would highly recommend it. Was this review 2 hours well spent? Was it worth risking my receiver frying? You betcha!

I have an Onkyo TX-NR609 receiver that is always very warm, even on standby. It sits on top of a table, so venting isn't an issue, it is just hot. Since the receiver is getting on in years and I want to extend its life a little, I bought this fan and placed it on the top of the receiver over what is presumably the power supply area (hottest part of the vents) and turned it on. Now the entire top venting area is cool to the touch. This thing really works! It is silent as can be and just runs, doing its thing which is pulling the heat out of the AV so that it doesn't build up. I should have bought this fan 14 years ago (if it existed then)!

Nice 5" fan. Not a wind machine. More of a gentle breeze. I use it to cool my Tablo. I added a small piece of foam AC filter to keep out dust.

This product does a good job of cooling my PS5. I place it behind the PS5 and turn it on. There are several speeds. The unit is quiet. I start the fan when I turn-on the PS5 so that it won't overheat inside the entertainment console. The price is very competitive, and you can added another fan if necessary. You have the ability to couple additional fans. I strongly recommend this product...

What a quiet fan. It works very well and is perfect for what I needed.

Great fan very quiet and works wonderfully.

I have two of these fans for myself and sent one to my brother. All three are for Fosi amps. The fosi fan I bought originally just did not push enough air. The infinity fan on the highest speed dissipates the heat generated by my Fosi ZA 3 amp and Fosi BT20A Pro amp. I am Very Happy!

静音タイプの冷却ファンで、スライドスイッチによる弱中強3段階の運転モードが選択でき、ファン同士の連動運転も可能となっている 前々からPCの冷却手段に導入しており、優秀なファンというのは既に実証済み。今回は、自分でレストアしたDENONのプリアンプの延命処置として予備機1台を使用したが、電源トランスの排熱量が予想を超え、1台では明らかに能力不足だった為直ぐに2台目を購入。 ファン側での連動運転はせず、プリアンプ側の電源で同時運転させているが、2台動かしていても中運転までなら全く気にならないし、電源トランスの排熱も良好。シンプルながら信頼性の高い冷却ファンだと改めて実感。 ゲームハード等の冷却にも大変オススメ！

I use them to cool my Desk NAS, they are silent, have good airflow and do not vibrate - perfect for my application.

Excelente producto, excelente acabado y presentación, funciona perfecto, enciende y apaga junto con el receiver conectado al USB, o si compras el cargador lo conectas al regulador o al enchufe de pared. es lo más recomendable para evitar daños al puerto USB del amplificador, es silencioso, imperceptible incluso a volumen bajo y el receiver trabaja mucho muy fresco en la velocidad más baja del ventilador, que impresionante, mega recomendado! He comprado 5, uno para cada amplificador.

Veilig met de roosters en stil. Goed te plaatsen met de rubberen steuntjes en/of met een schroef/boutje door deze aansluitingen Voldoende luchtverplaatsing voor mijn doeleinden. Maar je kunt er makkelijk meerdere aan elkaar koppelt één voeding

Quiest aesthetic fan. Small, light, and works well. 4 mode.. off, low, medium and high. I have it mostly on high as electronics is inside an enclosed area. Unfortunately there is no auto on/off switch.. would be perfect if it automatically turns on everything my electronics go on, but I am not sure if there's such a product currently on thr market. This is a great fan, may get more.