Replacement Propeller, Propeller Dia. (In.) 18 in, Bore Dia. (In.) 1/2 in, CFM @ 0.000-In. SP 2,145 cfm, CFM @ 0.300-In. SP 880 cfm, Min. HP 1/12 hp, Max. RPM 1,140 RPM, Pitch (Deg.) 19 Degrees , CCW Rotation, Number of Blades 2, Propeller Material Aluminum, Galvalume Spiders, For Use With Air Conditioning Condensers, Heat Exchangers and Unit Heaters, Heat Pumps, Requires -