Propeller, Replacement, Propeller Dia. (In.) 24 in, Bore Dia. (In.) 3/4 in, Number of Blades 4, Pitch (Deg.) 16 Degrees , Blade Material Spark Cast Aluminum, Keyway (In.) 3/16 in W and 3/32 in D, Number of Set Screws 2, Rotation CW Facing Discharge, Required Motor HP 1/2, Required HP @ Higher RPM -, RPM Low -, RPM High -, Max. RPM 1725, CFM @ 0.000-In. SP 5300, CFM @ 0.125-In. SP 4910, CFM @ 0.250-In. SP 4360, CFM @ 0.375-In. SP 3,775 cfm, CFM @ 0.500-In. SP 3,070 cfm