Product Description Fasco part number 1-6051.Squirrel Cage Blower Wheel.Specifications:Single InletDiameter: 3-27/32 in.Width: 1-13/64 in.Bore Size: 1/4 in.Rotation: CCWMaximum Speed: 5640 RPMMaterial: GalvanizedReplacement for numbers 87106051, 8710-6051 and AP3143728.