Propeller Replacement Propeller Dia (In.) 24 in Bore Dia (In.) 5/8 in Number of Blades 3 Pitch (Deg.) 11 Degrees Blade Material Aluminum Keyway (In.) - Rotation CW Facing Discharge Required Motor HP 1/12 Required HP @ Higher RPM 1/4 hp Required HP @ Lower RPM 1/12 hp RPM Low 1 140 RPM RPM High 1 725 RPM Max RPM 1725 CFM @ 0.000-In. SP 3573/2361 CFM @ 0.125-In. SP 3290/1949 CFM @ 0.250-In. SP 3023/1599 CFM @ 0.375-In. SP - CFM @ 0.500-In. SP - Blade Height (In.) 2 7/8 in