Propeller Replacement Propeller Dia (In.) 6 1/2 in Bore Dia (In.) 3/16 in Number of Blades 4 Pitch (Deg.) 19 Degrees Blade Material Aluminum Keyway (In.) - Number of Set Screws 1 Rotation CW Facing Discharge Required Motor HP 1/100 Required HP @ Higher RPM - RPM Low - RPM High - Max RPM 3000 CFM @ 0.000-In. SP 500 CFM @ 0.125-In. SP - CFM @ 0.250-In. SP - CFM @ 0.375-In. SP - CFM @ 0.500-In. SP - Blade Height (In.) - Blade Width (In.) 3/4 in