Replacement Propeller, Hubless, Propeller Dia. (In.) 24 in, Bore Dia. (In.) -, CFM @ 0.000-In. SP 6,663 cfm, CFM @ 0.300-In. SP 5,649 cfm, Min. HP 3/4 hp, Max. RPM 1,140 RPM, Pitch (Deg.) 26 Degrees , CCW Rotation, Number of Blades 3, Propeller Material Aluminum, Galvalume Spiders, For Use With Air Conditioning Condensers, Heat Exchangers and Unit Heaters, Heat Pumps, Requires Interchangeable Hex Hub 2A563 or 2A564 or 2A565