Replacement Propeller Hubless Propeller Dia (In.) 10 in Bore Dia (In.) - CFM @ 0.000-In. SP 500 cfm CFM @ 0.300-In. SP 286 cfm Min HP 1/20 hp Max RPM 1 725 RPM Pitch (Deg.) 20 Degrees CW Rotation Number of Blades 4 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