This mount is designed to mount a 80mm fan directly on the pcb board to prevent overheating of the servo control board. The fan can only used with removed bottom cover.Remove the two screws on the left side of the servo control board. Replace the spacer tubes between the pcb and the case with the fan mount. Be carefull, the internal power supply provides 24V. So only use a 24V fan. The fan can be directly connected to the 24V input of the servo control board. You need the following to: M4x30 screw M4 nut 24V 80mm Fan (found it on ebay for 7,50â?¬)