Performance "220V Cooling Fan" blade balance to the entire DC fan, DC fan blade balance than being commonly used dynamic balance, it is the principle of adjustable vanes for DC fans and single-stage rotor blade adjustable DC fans, Because only one level of the impeller, mass imbalance caused due to wear it all focused on the impeller, "220V Cooling Fan" balancing process is a single plane balancing process, namely static equilibrium process. If it is determined the vibration caused by mass imbalance, so long as the measurement point of the horizontal or vertical direction in the vicinity of the bearing housing shell vibration, use of influence coefficient method, the "220V Cooling Fan" impellers increase, will be able to reduce fan vibration to within the desired range.