Replacement Propeller, Propeller Dia. (In.) 20 in, CFM @ 0.000-In. SP 3,920 cfm, CFM @ 0.300-In. SP 2,934 cfm, Min. HP 1/2 hp, Max. RPM 1,140 RPM, Pitch (Deg.) 29 Degrees , CCW Rotation, Number of Blades 4, Propeller Material Aluminum, Galvalume...