DC "24V DC Cooling Fan" In operation, the rotating blades odd pieces, the weight of several blades varies, the weight of the fan blade, the more consistent effect on the airflow, the more stable, less vibration. Second, there may be a core shaft and bearing friction, resulting in DC fan vibration. DC fan vibration is the best solution in the open mold, the mold sophisticated enough to do, "24V DC Cooling Fan" balanced blades do the best, followed by the remedy is to produce balanced, focused on the blades increase in the removal of some of the excess compound. For the shaft and bearing friction problem, adjust "24V DC Cooling Fan" of the assembly size on it. DC fan must be shut down to repair (remove dust accumulation, redo balancing). Because this time is very dangerous, the user must not be forced to use. DC fan vibration when approaching a dangerous level, there will be vibration meter alarm.