Replacement Propeller Hubless Propeller Dia (In.) 20 in Bore Dia (In.) - CFM @ 0.000-In. SP 3 819 cfm CFM @ 0.300-In. SP 3 013 cfm Min HP 1/3 hp Max RPM 1 140 RPM Pitch (Deg.) 26 Degrees CW 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