First choice "220V Cooling Fan" must be able to provide sufficient exhaust volume, under the high temperature inside the cooling equipment of hot air; when the temperature is relatively low and less when hot air is doing the opposite of work. Secondly, the "220V Cooling Fan" sensor installation should pay attention to the location of choice, the sensor is put in place, try to make the sensor can be directly clamped surface to be cooled. In the cooling fan is running, a temperature-controlled cooling fan will run at a faster pace if the thermistor feel higher temperatures; and at lower temperatures, it will operate at low speed; in these higher and intermediate low, "220V Cooling Fan" will hardly speed due to temperature change.