Wathai 4 x 120mm GPU Mining Rigs Server Racks Fan with 100V - 240V AC Power Variable Speed Control, Big Airflow for DIY Cooling and Ventilation AV Cabinets, TVs Routers. Audio Amplifier, Refrigerator

These are good, solid fans, and come joined together with a removable bracket. They also come with a set of 4 "feet", making it useful to set on other devices for cooling.At full blast, 170CFM for the pair, they are fairly noisy. But with the controller set to the 9 or 10 o'clock position, they are fairly quiet. To be honest though, if you were to use these for studio or home theater gear, there are much more quiet fans available.I'm using them with HEPA filters for workbench "clean area" use, so the noise is not a relevant factor.

I think it's pretty nice and moves alot of air. I'm using it in my Grooming but as a exhaust fan that I attached into the bus window. Pretty quiet too!!

I have been using these fans (the three-fan configuration) for several days now, and so far they're excellent. I am using them to bring in cold air through a window at night, and they're perfect for that task. The power supply unit comes with a relatively long cable, but for my situation I've opted to use an additional 33 ft. DC extension cable that I purchased separately. This allows me to keep the fan controller in a more easily accessible location.The fans themselves seem to be fairly well built, and they're held together with metal brackets between each individual fan. The grills on my fans are metal, just like the ones shown in the product images. The quality seems reasonable, and I think they'll hold up over time. The speed controller is rather lightweight and cheap feeling, and I'm not sure how well it's constructed internally. Nevertheless it does work properly, and it offers a good range of control for the fans. It doesn't get hot or make any worrying noises, so that's a good sign.I'll be interested to see how well these fans hold up after long term use. Right now I'm planning to use them during the winter months to bring cool air into a room with multiple computers. I'd recommend these fans.

Use this to cool two, 2U rack spaces with converters & headphone amplifiers in my recording studio (mounted it about 8" behind the rack between the two spaces) and LOVE how quiet it is and only need to run it at its lowest setting and it does the job more than adequately! My gear was too hot to touch before installing this fan unit and now it is completely cool to touch! Will be getting 2 or 3 more.UPDATE: 6 months later, I bought 2 more and all 3 sets of them are at the slowest speed and did a fine 9super quiet) job of cooling. A month after I installed the other two groups, the first set's vari-speed control on the power supply will now only play on "high". I have to constantly turn it on and off for the noise is too much while working in my recording studio. Need to find a replacement voltage controller. Great while it lasted.

Works very well.

Great item, fast shipping and good qualities A++++++++

I have a small kitchen window that I like to keep a small exhaust fan in. I used to buy those three fan jobs that would gunk up, be impossible to clean then die. These fans are super easy to clean. They also move the air like nobody's business! I love the variable speed control. At the highest speed they can be a bit noisy but nothing you cannot live with when you need good air movement. Another plus is they are very portable. You can move it around anywhere you need them for just about any purpose. Great item for the price and I expect they will last a while if maintained properly.

I've had these fans for a while now, and they've been working fine, good product.