Abstract: A centrifugal blower for conveying an air and particle mixture having an impeller with a curved revolving plate portion, that is raised in the center, with backward curving blades connected thereto between the raised center portion and the outer periphery. The curved blades extend in a perpendicular direction with respect to the plane defined by the outer periphery of the plate portion. The curved blades have a free top edge and are connected to the plate portion starting at the end of the raised center portion. An inclined edge on the blade extends from the connection point at the raised center portion to the free top edge. The angle of the inclined blade edge from the point of connection at the raised center portion to the free top edge is greater than 40.degree. relative to the longitudinal axis of the impeller. The slope between the raised center portion and the outer periphery of the base plate portion is curved in a manner to facilitate particle movement.