Blower Wheel, Product Type Wheel Kit, Wheel Type Forward-Curved, Number of Inlets 1, Wheel Diameter 3 3/4 in, Bore Diameter 5/16 in, Wheel Material Steel, Rotation CW Closed End, Wheel Hub Position Center, Wheel Construction Strip, Maximum Speed 3,000 RPM, Number of Blades 22, Blade Width 2.5 in, Includes Set Screws Yes, Compatible with Grainger Part Number 4KA73, Compatible with Brand Tjernlund, Compatible with Series HS1, GPAK1, Compatible with Manufacturer Model Number HS1