"24V DC Cooling Fan" to make use of mid-range or low gear. Usually the first to open files fast, cool down more slowly with the file, you can reduce the fan power consumption. When you use the best fan placed next to the door, windows, easy air circulation, improve the cooling effect, reducing power consumption. To maintain normal operation. Note fan routine maintenance. To maintain its good performance, avoid fan deformation, vibration occurs, which to some extent, in favor of energy saving.