Replacement Propeller Industrial/Commercial Heavy-Duty Propeller Dia (In.) 30 in Number of Blades 4 Pitch (Deg.) 22 Degrees Blade Material Galvanized Rotation CW Required Motor HP 1 Required HP @ Higher RPM 1 hp Required HP @ Lower RPM 1/4 hp RPM Low 720 RPM RPM High 1 140 RPM Max RPM 1140 CFM @ 0.000-In. SP 9804 CFM @ 0.125-In. SP 9222 CFM @ 0.250-In. SP 8667 CFM @ 0.375-In. SP 8 106 cfm CFM @ 0.500-In. SP 7 345 cfm Blade Height (In.) 2 3/16 in Blade Width (In.) 6 3/8 in