My last cable modem up and died after just one year, I'm pretty sure because it got so hot all the time. It was a modem+router so extra hotty-hot-hotness from all the circuitry packed into one case. My son thinks this is sort of normal lifespan for routers and modems - he expects only 3 to 4 years. Well I got 8 years out of one of my last modems and 10 out of the other (same modem, WTGS54 whatever that was, it was a very good modem for its time and I got more than enough throughput from it for my needs, including streaming video, I was still running one up until 2 years ago).So *I* was shocked at its short lifespan (especially given the cost, over $200) even if he wasn't.There is just more electronics involved in these tasks, packed into less space, than the older modems. They are GOING to get hot. So in order to keep that from happening again I bought this USB fan kit, comes with 2 fans hooked together, to replace the floor fan I had aimed at the new modem and separate router. I was getting some of these anyway to put on my LED grow lights to cool them (they will ALSO last longer if you keep them cool) so I took one of those and shoved it under the router (because its a flat design, give me vertical any day) and stood the other one up next to the cable modem (which is vertical).I've got them on low and they are cooling both devices very well. On low the router gets barely slightly warm, and the better design of the vertical case for the modem leaves it totally cooled down with this little fan. If I had it to do over I'd look harder for a vertical router as well, its easier to keep them cool. AND they take up a lot less space! I've got a bunch of old computer cases with fans going to waste, I will likely make some USB fans from all those old bits and pieces, but they are likely to be a lot louder. This fan is extremely quiet even on high. I can't hear it at all on low.Also these fans in particular are optimized for humid environments so I wouldn't use anything else in my grow room. A lot of people use the other dual fan kit with the larger fans but they are using them to move air over microgreens to cut down on mold and fungi, I don't have that problem, I just need to cool the lights to improve their longevity, so I'm trying these smaller fans (take up less headroom over the lights, giving me more space under the lights because I can move them further up).I highly recommend cooling your router/modem/game console whatever electronic devices you have sitting around generating heat with some kind of fan, and these are very quiet, easy to assemble (as in plug them in), and very effective. I've seen some people insist that you shouldn't do this because it might "blow dust into the case" - where do these guys live, in the middle of death valley? LOL! Just do it. I've had a floor fan blowing across my very very ancient laptop to keep it from overheating for about 5 years now (even laptop coolers can't cool it enough) and its still going strong. I can even play (very very old) games on it still. Heat will kill your devices WAY faster than whatever tiny specks of dust these fans probably won't blow into the cases anyway.Also, if you have one of those stupid refrigerator closet things where they've built an enclosure all the way around the fridge, that is trapping heat and shortening the life of your expensive stainless steel fridge - you can use these fans to draw hot air out of that too (though I'd go with the larger version for that). Personally I'd tear that crap out but failing that, install these in a side or back wall and pull that heat out of there. Your fridge will thank you. Your bank balance will be the better for it over the long haul.

I just bought a used Onkyo TX-SR805 receiver already knowing that they run hot from reading reviews. When I arrived home I immediately set it up and liked the sound. Within 30 minutes I put my hand on the top of the receiver and could not believe how hot it was. You could fry an egg on it. I knew this was not good. I then noticed that the side vents, one on each side, housed a fan each. The fans were not working. I believe this is one of the reasons Onkyo has a reputation for very hot receivers, inefficient cooling system. Replacing them would probably not be cost effective.I purchased this set of fans from Amazon and set them up vertically at the rear of the receiver, one on the left and one on the right, to push the air towards the front of the receiver and out of the cabinet (I have an audio visual cabinet with doors. I keep the doors open). This setup produced cooling and the fans were powerful enough to push the air out of the cabinet but the cooling was only fair. I was not satisfied since the receiver top was still hot, though not as hot as before.I now proceeded to lay both fans on the hottest sections of the receiver venting the hot air out of the receiver and was amazed at the results. The receiver cooled down so much that when I touched the top of the receiver I felt no heat. I ran my hand across the top of the fans and I felt the hot air being drawn out completely. By the way the setting I have it on is HIGH. I didn't try medium or low since this receiver produced atomic heat. The receiver remained pretty cool with this second setup.I just purchased another set to stand up at the rear of the receiver (as was my first setup) to push the hot air forward away from the front of the receiver, as I plan to elevate on 4 columns (4 black pepper shakers from Dollartree-perfect size-about 1/8" taller than fans) my turntable. It remains pretty stable.As mentioned previously, I have my audio visual components (8 in total) enclosed in a cabinet with doors. There is an open back and the doors swing out and to the side and back, out of the way, making it perfect for my rig.Will probably update with photos once everything is in place.Definitely recommend these fans. Especially for the price. I was going to buy AC Infinity's more expensive setup with the 3 fans that lays on top of the receiver and vents out the rear but didn't want to spend $119 for it. I read in the reviews that it was a little noisy and that thermostat is inaccurate. Two sets of fans for $30 and 4 black pepper shakers from the Dollar tree (come in a set with salt) for a total of $34Will actually do a better job because you are using 4 fans this way, which can be Daisy chained compared to only 3 fans with the $119 rig.As a former Marine we are taught to improvise and improvising can save beaucou bucks.Wishing you the best and God bless.UPDATE:. Just received the second set of fans and set them up at the rear of the receiver to push the air out of the front of the cabinet. Fan setting is on high for all the fans. Works marvelously! Haven't purchased the pepper shakers yet from Dollartree (was there today and forgot-set it up earlier with two of the shakers-one salt white and the other pepper black-work perfect!) so I have the turntable set up on empty medicine bottles. Supports the turntable steadily. Bottom of turntable is not hot as air extracted upwards from receiver vents is immediately being forced forward by rear fans and forced out of the front of the cabinet.These fans are GREATTT! I can feel the hot air being pushed out the front when I stand in front of the cabinet. Feels like a furnace is on. Really glad I found these on Amazon because this is really a great receiver and was concerned that it would sizzle out on me. Now I have to figure out how to hide the wiring on the floor.Pictures enclosed for viewing fan setup and turntable elevation.Wishing you all the best.

These fans have 3 speeds, on the low and medium speeds they are basically inaudible. On the high speed they make a very faint sound, but move more air. Even on high speed the noise isn't objectionable and is only audible in a quiet room.I put them under a mobile radio because it was getting a bit warm if used for extended periods of time, the rubber cushions on the fans made a nice base on which to set the radio so the fan vibration doesn't carry through to the radio. The fans take very little power and work great.

That is tweaked to the max. It set the laptop upside down with no cover so the pointless heat sinks have more space.But long story short the circle on the bottom of these pretty much sit directly on the heat sink and they are running significantly coolerThe only thing is it would be better if each at its own power supply and more power it’s kind of weak but I mean I dropped the temperature a good bit so it did its job but. Could use a little more horsepower

We've bought this brand before and very happy with the price, quality and performance of these fans. AC Infinity uses high quality fan motors and parts, from fan blade rotors to the fan housing - the plastic is thick and heavy, metal grill guards and rubber feet. They have some significant weight to them.The only way AC Infinity could improve on the quality of these fans to into industrial grade is if they were to do an all metal fan blade rotors and fan housing, but that also likely would increase the weight and price of the fans.These fans are a twin-pack, connected to a controller switch that has Off/Low?Medium/High speeds for both performance and noise control. That being said, even on High, these fans are pretty almost whisper-quiet, and any other noise/music/sounds in the background pretty much drown these out.Each fan as a decent but not overly long length of cord to space the fans apart up to the control module and another length of cord to the usb-a plug. For most people's needs, the length of cord should suffice.This set also includes a built-in usb-a Female coupler into the same cable, that allows you to daisy-chain another single or twin set of fans. This is a very thoughtful design feature included by the company. These fans easily run off a single usb phone wall charger, or most usb ports on the back of a/v receivers, projectors, tv's , etc.I don't know how many fans can be daisy-chained to run of a single regular usb power feed (usb phone wall charger, a/v rceiver, etc) but this company also sells a separate Turbo Booster usb power brick that does provide more power for extra fans if you need multiple sets of single or twin-pack fans.People who require the fans being a fair distance apart may be better off buying a set of single fans, and daisy-chain them together.The fans have a set of 4 rubber feet on both sides of the fans, and include metal fan grills on both sides of the fan. The feet and grills can be removed as/if needed, if mounting into a cabinet or wherever you need them for your application.The package also includes a zip-tie or two, and a cable hook/guide with sticky tape, allowing for a bit of tidy cable routing management. Again, very thoughtful of the company to provide these few cents worth of useful extras at no extra cost. This comes in handy when you're mounting the fans inside a A/V cabinet or wherever and can tie up and bundle the excess length of cord or route the cables neatly instead of them just being a loose pile of random wires aka 'rats nest'.As we've said before, this isn't our first AC Infinity purchase, and by far won't be the last. When you buy a product and realize its good quality for value, reliable and long lasting, it's a no-brainer to stay with that brand.

Lo empleo para enfriar amplificadores de sonido. Dan un excelente desempeño, sin ruidos.

Very efficient and quality product

Son unos ventiladores muy silenciosos y hacen un trabajo estupendo sobre mi etapa de potencia ya que cogía una temperatura bastante elevada y a sido poner estos ventiladores y la etapa está tibia cuando trabaja. Estoy muy contento con el resultado.

This fan is very good has a good build quality, looks very good and runs very quietly , performance is also good but only negative cost is very high.