Method to determine blade shape of sirocco fan

A method of determining the shape of a sirocco fan blade method, the blade having such a fan can increase fan efficiency and reduce aerodynamic noise, the method comprising determining the blade airfoil NACA-section defined by line equations of the airfoil and thickness distribution and the center line , a lower surface, and the centerline maximum respectively determined according to the following equation ordinate steps: Ta = 2m / p where, Ta is the intake corners, m is the maximum ordinate of the center line, and P is the maximum ordinate chordwise position.