The main performance of the fan is reflected in the following aspects: speed, blade shape, blade, angle and bearing system. Under normal circumstances, the speed of the fan is indicated on the instruction manual of the cooling fan. Generally speaking, 30% of the cooling effect depends on the speed of the fan. But the fan is not the higher the speed the better. The correct fan speed should be determined according to the calorific value of the product. The fan speed selection of different specifications should be differentiated. The basic principle is: under the premise of generating the same air volume, the larger the fan, the lower the speed, and the noise will also be lower. smaller.