Lau Blower Wheel Part Number 01333603, DD9-7A. Replacement "DD" Preslok Wheels for direct drive blowers are dynamically balanced and forward curved, incorporating the Preslok center disc construction for positive blade retention, providing higher RPM capability and industry proven reliability. Wheels are made of galvanized, cold-rolled steel. Rotation is by viewing hub (bore) end.
Specifications:
Bore Size 1/2"
CCW Rotation as viewing bore end. Convex
Outside Diameter 9-1/2", Length 7-1/8"
Number of blades 43

Please see all pictures to see how the blades are curved and where the bore