Replacement Propeller Propeller Dia (In.) 18 in Bore Dia (In.) 1/2 in CFM @ 0.000-In. SP - CFM @ 0.150-In. SP 2 814 cfm CFM @ 0.300-In. SP - Min HP 1/4 hp Max RPM 1 100 RPM Pitch (Deg.) 32 Degrees CW Rotation Number of Blades 4 Propeller Material Aluminum Galvanized Spiders For Use With 13 Seer Air Conditioning Condensers Heat Exchangers and Unit Heaters Heat Pumps Requires -