I have these fans with decoupling elements for my Zyxel NAS acquired because the original was built so loud that you could clearly hear him in the living room, even though the device is in a closet.
What can I say: Installation and connection are very easy and since the device is only audible when esim room really aäußerst is low or the disks come out of standby.
For me the best solution, therefore, a perfect score!
