Replacement Blower Wheel Product Type Replacement Blower Wheel Wheel Type Radial Number of Inlets 1 Wheel Diameter 13 1/2 in Bore Diameter 7/8 in Wheel Material Aluminum Rotation CW/CCW Hub Type Not Applicable Wheel Hub Position Center Maximum Speed 1 750 RPM Number of Blades 6 Blade Width 8.1 in Includes Set Screws Yes Includes Set Screws Compatible with Grainger Part Number 4C121 Compatible with Brand Dayton Compatible with Series Radial Blade Direct Drive Blowers