Propeller, Replacement, Propeller Dia. (In.) 12 in, Bore Dia. (In.) 3/8 in, Number of Blades 3, Pitch (Deg.) 28 Degrees , Blade Material Aluminum, Keyway (In.) -, Rotation CW Facing Discharge, Required Motor HP -, Required HP @ Higher RPM 1/25 hp, Required HP @ Lower RPM 1/70 hp, RPM Low 1,050 RPM, RPM High 1,550 RPM, Max. RPM 1725, CFM @ 0.000-In. SP 928/629, CFM @ 0.125-In. SP 799/437, CFM @ 0.250-In. SP 664/174, CFM @ 0.375-In. SP -, CFM @ 0.500-In. SP -, Blade Height (In.) 2 9/16 in