The fan mounts reduce the transmission of vibrations from the fan to the chassis. They?re used instead of fan screws to fasten the fan. Using the fan mounts you get a gap of approx. 1mm between fan and chassis so vibrations cannot be transferred directly.
If fans are fastens with screws there?s a direct contact between fan and chassis. Even small vibrations pass to the chassis and get audible although the fan was quiet before mounting it. The chassis works like a speaker. The decoupling of the fan eliminates this effect.
The fan mounts are not suitable for fans with continous screw holes (from the top to the bottom of the fan, like a tube).
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