Replacement Propeller Hubless Propeller Dia 24 In CFM @ 0.000-In. SP 5090 @ 0.300-In. SP 4525 Min HP 1/2 Max RPM 1140 Pitch 18 Deg Clockwise Rotation Number of Blades 4 Propeller Material Aluminum For Use With Air Conditioning Condensers Heat Pumps Heat Exchangers and Unit Heaters Requires Interchangeable Hex Hub 2A563 or 2A564 or 2A565