Propeller, Replacement, Propeller Dia. (In.) 12 in, Bore Dia. (In.) 3/4 in, Number of Blades 4, Pitch (Deg.) 24 Degrees , Blade Material Spark Cast Aluminum, Keyway (In.) 3/16, Number of Set Screws 2, Rotation CW Facing Discharge, Required Motor HP 0.25, 0.75, Required HP @ Higher RPM 3/4 hp, Required HP @ Lower RPM 1/4 hp, RPM Low 2,250 RPM, RPM High 3,450 RPM, Max. RPM 2250/3450, CFM @ 0.000-In. SP 1280/1960, CFM @ 0.125-In. SP -, CFM @ 0.250-In. SP -, CFM @ 0.375-In. SP -