1: The exhaust volume is high or low. The DC fan has larger blades than the AC fan, and the exhaust volume is larger.
2: Different materials, the cost varies. DC brushless fans usually use plastic frames, small motors, less copper wires, and low-cost raw materials. AC fans are brushed motors, the motor stator is large, there are many copper wires, and the frame must be made of aluminum, which increases the cost a lot.
3: The application time varies. The life of DC fans is longer in comparison.
4: The working voltage of the power supply system is different, and the output current method is different. DC fans usually have a lower working voltage. The commonly used ones are 5V, 12V, 24V, and 48V, and the AC ones are 110V, 220V, and 240V.
5: Safety hazards. The working voltage of the DC fan power supply system is low, and there is no risk