"Waterproof Cooling Fan" dedicated to the switching power supply cooling fan, voltage 5V, 12V, 24V, current 0.10-0.45A, wind 13.80--27.09CFM, noise 27.1--43.0dbA, fan life in the 40000-50000 hours, bearing hydraulic bearing with double ball bearing fan temperature, stable performance! Its working principle is: energized coil in a magnetic field force rotates. Form of energy is transformed: the main electrical energy into mechanical energy, while the coil resistor, so there is an inevitable part of energy converted to heat.