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Bgears Cooling Fan Adapter 140mm-Black BlackBgears Fan Adapter 140mm Black. Fan adapter 140mm is design to mount a 140mm fan to a 120mm pre-drill hole on the computer case. Or it can be used on a 120mm fan to mount on a 140mm pre-drill holes on the computer case. The adapter has a funnel design to channel airflow smoothly. Convert 140mm to 120mm mo..