Around "Tiny Cooling Fan" is nothing more than a few factors are several major factors that voltage, current, power, speed, noise, and the like. I believe that many customers want to buy low noise, large air volume of axial cooling fan, but in practical applications, "Tiny Cooling Fan" nominal value of maximum wind blowing amount is not actually get heat sink fan, air volume does not mean that the ventilation ability. Due to air flow, air flow path will encounter in their obstruction of fan heat protracted piece or component, the impedance will restrict the free flow of air. When that wind increases, pressure decreases. Therefore, there must be an optimum operating point operations, namely the intersection of "Tiny Cooling Fan" performance curve and drag curve.