"Mini Air Cooling Fan" With the application and ambient temperature changes, and sometimes require different speed fan to meet demand. Some manufacturers specially designed ebm adjustable fan speed cooling fan, manual and automatic modes. Manual is designed to allow users to use low-speed low-noise in the winter, in the summer when high speed to get a good "Mini Air Cooling Fan" cooling effect. Usually automatic type provided with a radiator thermostat thermostat sensor to automatically control the fan speed based on the current operating temperature, the temperature is high, the rotational speed is increased, the temperature is low, the reduced speed to achieve a dynamic balance, so that the "Mini Air Cooling Fan"noise and heat dissipation to maintain an optimal combination of points.