To reduce fan resistance

To reduce wall mounting fans resistance, so smooth fan operation, blades ideal working conditions are all part of the blade unit area substantially equal to the pressure. For this purpose, the blade surface should be smooth, curved rules, each from the blade root to the blade tip section having varying degrees of distortion. Free to change the blades are not allowed to use original shape, it is not allowed in order to avoid fan beat bump deformation. The more the number of blades, although having a large amount of wind, wind speed and ease a little faster, but the greater the power requirements of the motor. In order to save energy and materials, production at home and abroad were powered by three fan blades,standing fan shape mostly trilobal or sword-shaped