Replacement Propeller, Propeller Dia. (In.) 18 in, Bore Dia. (In.) -, CFM @ 0.000-In. SP 2,482 cfm, CFM @ 0.300-In. SP 1,496 cfm, Min. HP 1/6 hp, Max. RPM 1,140 RPM, Pitch (Deg.) 23 Degrees , CW Rotation, Number of Blades 3, Propeller Material Aluminum, Galvalume(R) Steel Spiders, For Use With Air Conditioning Condensers, Heat Exchangers and Unit Heaters, Heat Pumps, Requires Interchangeable Hex Hub 2A563 or 2A564 or 2A565