1, "220V AC Cooling Fan" blade curvature: in a certain range, the greater the curvature of the blades, at the same speed, the greater the kinetic energy of the gas, i.e., the larger the air volume and pressure; same time, the greater the drag on the blade require motor torque greater.
2, "220V AC Cooling Fan" blade inclination: the greater the inclination, the greater the pressure difference between the upper and lower surface of the blade, the greater the pressure at the same speed; but the surface pressure, may have reflux phenomenon, but reduce fan performance. Thus, the blades should also enhance the inclination within certain limits.
3, "220V AC Cooling Fan" blade spacing: the distance between the blades is too small, it will cause flow disturbances, increasing the friction surface of the blade, reducing the efficiency of the fan; the distance between the blades is too large, it will cause a pressure loss is increased, air pressure inadequate.