Replacement Propeller Industrial/Commercial Heavy-Duty Propeller Dia (In.) 24 in Number of Blades 6 Pitch (Deg.) 38 Degrees Blade Material Galvanized Rotation CW Required Motor HP 2-3/4 Required HP @ Higher RPM 2 3/4 hp Required HP @ Lower RPM 1/2 hp RPM Low 850 RPM RPM High 1 450 RPM Max RPM 1450 CFM @ 0.000-In. SP 11 165 CFM @ 0.125-In. SP 10 869 CFM @ 0.250-In. SP 10 556 CFM @ 0.375-In. SP 10 220 cfm CFM @ 0.500-In. SP 9 856 cfm Blade Height (In.) 3 5/8 in