"Micro Cooling Fan" pressure depends on the shape of the blades, area, height and speed, the impact of the first three of the more complex relationships in speed is straightforward - the faster the speed, the greater the pressure. Air from the fan to the direct effect of wind pressure. "Micro Cooling Fan" outlet to the bottom of the heat sink seems only a short period of a few centimeters, but taking into account the impact of complex and intensive cooling fins, to make the air flow effectively covers the whole fin is not really that simple. Heat sink design process, although it will try to avoid excessive drag, but in order to ensure adequate cooling area of "Micro Cooling Fan" to make certain requirements are inevitable.