First, the choice of "24V DC Cooling Fan" must be able to provide sufficient amount of exhaust (speed), under the high temperatures of the hot air inside the cooling device; when the temperature is relatively low and less hot air when it is done Instead of working. Secondly, "24V DC Cooling Fan" position sensor installation choices should pay attention to the sensor in the proper position, try to make the sensor directly clamped surface to be cooled. In operation, a temperature-controlled "24V DC Cooling Fan", will run at a faster pace if the thermistor temperature feel higher; while at lower temperatures, it will operate at a lower speed; in these more high in the middle and lower fan speed will almost never due to temperature change.