Propeller, Replacement, Propeller Dia. (In.) 30 in, Bore Dia. (In.) 1 in, Number of Blades 6, Pitch (Deg.) 30 Degrees , Blade Material Spark Cast Aluminum, Keyway (In.) 1/4, Number of Set Screws 1, Rotation CW Facing Discharge, Required Motor HP 235, Required HP @ Higher RPM 5 hp, Required HP @ Lower RPM 2 hp, RPM Low 1,170 RPM, RPM High 1,625 RPM, Max. RPM 1170/1390/1625, CFM @ 0.000-In. SP 12,215/14,450/16,800, CFM @ 0.125-In. SP -, CFM @ 0.250-In. SP -, CFM @ 0.375-In. SP -