The four rubber connectors on the fan case act as a vibration damper to absorb the vibration of the running fan. This can reduce significant vibration between plastic fan case and heatsink！

記得風扇的軸承晃動的蠻有動感的！
四個緩震橡膠被你用束線固定....................
在風扇全速下，是否會有些許的微震動聲！