"Micro Cooling Fan" during fan operation, to minimize wind resistance, so smooth, should try to make the first fan blade from the root to the tip of per unit area subjected to the same pressure. For this purpose, the blades are designed from the blade root to tip twist angle decreases. Of course, this angle is not too small, otherwise it will affect air pressure and air flow. Generally speaking, "Micro Cooling Fan" average twist angle of the blades of the desirability of 160 ^ -220, ceiling fans 80 ^ -100. And appropriately increase the width of the table fan blades (made of palm leaf shape), it helps to reduce wind pressure and noise of the blade. "Micro Cooling Fan" the number of blades and blade pressure and noise is also relevant. Although the increase may increase blade pressure, air flow, but also increases the noise.