And "Tiny Cooling Fan" related to the amount of wind is how come? Air volume fan ventilation area refers to the area of the plane and plot speed. Ventilation area is exports minus scroll area at the projected area of the tongue. Plane speed velocity gas stream through the entire plane, the unit is m / s. Flat rate constant, "Tiny Cooling Fan" blade impeller diameter, the greater the ventilation area, the greater the amount of wind. "Tiny Cooling Fan" the greater the amount of wind, cold air, the greater the heat absorption, can take more heat transfer of air flow, cooling effect is more obvious.