‘ Replacement Propeller, Hubless, Propeller Dia 18 In, CFM @ 0.000-In. SP 2944, @ 0.300-In. SP 1998, propeller pitch Min HP 1/4, Max RPM 1140, Pitch 29 Deg, Clockwise Rotation, Number of Blades 3, propellerhead reason 8 for beginners Propeller Material Aluminum, For Use With Air Conditioning Condensers, Heat Pumps, Heat Exchangers and Unit Heaters, Requires Interchangeable Hex Hub G0721612 or G2348805 or G1488952 ‘