Abstract: A blade for an industrial axial fan including an attachment and an airfoil having a longitudinal axis, the attachment connecting the airfoil to a hub, wherein the attachment has a stiffness and a stiffness distribution that allows the attachment to deform in a way to have at least an inflection point along the longitudinal axis during the operation of the axial fan. The attachment includes a first part for connection to the hub and a second part for connection to a proximal end of the airfoil. The blade further includes a weight fixed at a distal end of the airfoil. The attachment has a decreasing stiffness along its longitudinal direction from the first part to the second part so that during the operation of the axial fan, the attachment deforms and includes the inflection point to thereby induce the blade to vibrate according to a second vibrating mode.

Abstract: The present invention concerns a blade for industrial axial fan and an industrial axial fan comprising such blade. More in details, the present invention concerns a blade for industrial axial fan comprising an attachment and an airfoil, said attachment connecting the airfoil to the hub and characterized in that said attachment has a stiffness and a stiffness distribution that allows the attachment to deform in a way to have at least an inflection point during the operation of the axial fan.