"Micro Cooling Fan" beveled blade spinning downwards so that the air flow constantly negative pressure forming duct addition, all the fans are an odd number of blades, avoid resonance even page piece produced. Ceiling fan blades typically 3, table fan blades are generally 5, the common cross-section is generally curved fan blades. "Micro Cooling Fan" width and angle of the blade is designed to look at the motor load power may be. If you do not consider the speed of the motor power look certain words, but also depends on the angle of the blade, if the angle of the blade as the blade width is of course the wind. And "Micro Cooling Fan" fan design and production are showing a symmetrical structure regularity, so can generate uniform and stable air supply. Common are fan pages have three fans, four fan, five-leaf fan, double fan and so on.