Replacement Propeller, Industrial/Commercial Heavy-Duty, Propeller Dia. (In.) 36 in, Number of Blades 6, Pitch (Deg.) 38 Degrees , Blade Material Galvanized, Rotation CW, Required Motor HP 3-1/2, Required HP @ Higher RPM 3 1/2 hp, Required HP @ Lower RPM 3/4 hp, RPM Low 500 RPM, RPM High 850 RPM, Max. RPM 850, CFM @ 0.000-In. SP 21,250, CFM @ 0.125-In. SP 20,479, CFM @ 0.250-In. SP 19,602, CFM @ 0.375-In. SP 18,544 cfm, CFM @ 0.500-In. SP 17,277 cfm, Blade Height (In.) 5 1/4 in