Replacement Propeller Hubless Propeller Dia (In.) 28 in Bore Dia (In.) - CFM @ 0.000-In. SP 8 449 cfm CFM @ 0.300-In. SP 7 363 cfm Min HP 1 hp Max RPM 850 RPM Pitch (Deg.) 29 Degrees CW Rotation Number of Blades 5 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