If you want a quiet fan always get a larger fan than needed then rig it up to a controller and run it as slow as you can get away with,so if you need a 100mm fan get a 200mm and run it at 1/4 the speed and you'll get roughly the same air flow as a 100mm running at full blast,and use the idea above and it'll be even quieter and use bungie cords as suggested as fans can cause alot of vibration and low frequancy hum which you might not hear but your neighbours might,i use them for all my fans even my clip-on circulation fans which cause quite a hum when just clipped on to a braket.
bungie cords are your best friend when it come to mounting fans.
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