ANBE Sunon MagLev KDE1204PKV3 40x20mm-3pin 5200RPM 6.3cfmOnly 18dBA

I paid pennies for a second-hand ethernet switch (Dell 0F491K PowerConnect 2824), it's an industrial grade switch but it had a noisy fan.I popped the switch open and measured it, and this Sunon fan is pretty much an exact drop-in replacement. Same power plug and everything.Once it arrived I was able to install it in just a few minutes. Fixed!

-Seems used not new-Product listing incorrect for one of the models. There are only two models so you have a 50/50 chance of getting the right one.-They did work for their intended purposeA few months has past now since I last tried to review this product. I left dozens of reviews and they were all censored. Let's see if this one makes it!

I received two of these initially. Both had drips of solder on the fan blades that I had to remove. This solder could easily have broken off and ruined my hardware. Upon installation, one fan had a bad bearing resulting in a much louder fan than the other and a lot of vibration. A replacement was sent; also blobs of solder on the blades and part of the housing was burned with a soldering iron. Not the quality you should expect from Sunon.Fast forward one month and both fans are now incredibly loud and have terrible vibrations. These are supposed to be high quality industrial fans that are nearly silent. I can hear these through a wall into the next room. They should also last many years running 24/7 and they have failed after a month.Furthermore, this model fan has been out of production for quite some time yet Coolerguys magically has an unlimited supply. These are clearly not Sunon MagLev fans.Amazon issued a refund even though I was two days past my return window.

The fan itself is a great product with OK airflow and low noise level. One of the two fans I received, in the sealed bag, was clearly used with visible dust on the fan blades and the mounting holes had already been threaded. These fans could be taken off used equipment and sold off as used. You can the the dirty q-tip in the pictures after wiping the fan blades with it. So overall, this was a poor shopping experience with the vendor (CoolerGuys) and it maybe a hit or miss if you get a new/low usage fan or one with heavy use and dirt on the blades.

Bought it expecting to replace my Synology's DS 411+ defective fan and it was a total let down. The fan depicted in the picture is the KDE1204PKV3 MS.AR.GN, but I received the KDE1204PKV3 MS.AF.GN, which sends an RPM signal to the board instead of a Locked Rotor signal. Apparently the item on the link ahead is the real deal, at least according to the reviews I saw, specially the one from Bradley N.https://www.amazon.com/Sunon-KDE1204PKV3-MS-AR-GN-40x20mm-3pin-Low-speed-5200RPM/dp/B007WLQAKE/ref=sr_1_fkmrnull_3?crid=3PJU0POYP7TN3&keywords=sunon+maglev+kde1204pkv3&qid=1550000910&s=gateway&sprefix=sunon+maglev%2Caps%2C271&sr=8-3-fkmrnullThis was my first choice, but it would take longer to arrive and I didn't have the time to wait (I live in Brazil and the person bringing it to me was leaving the US).If you want to replace the little fan on your DS411+, keep in mind that this Sunon is 20mm thick whereas the original is only 10mm, which will require you to change the screws on it or other trickery to hold it in place.1 star for the seller, 5 stars for the item, which is actually good, despite not being compatible. I will have to find something else to use it for.