Propeller Replacement Propeller Dia (In.) 30 in Bore Dia (In.) 5/8 in Number of Blades 3 Pitch (Deg.) 38 Degrees Blade Material Spark Resistant Cast Aluminum Keyway (In.) 3/16 in W and 3/32 in D Number of Set Screws 2 Rotation CW Facing Discharge Required Motor HP 3/4 Required HP @ Higher RPM - RPM Low - RPM High - Max RPM 1075 CFM @ 0.000-In. SP 10230 CFM @ 0.125-In. SP 7200 CFM @ 0.250-In. SP 3820 CFM @ 0.375-In. SP - CFM @ 0.500-In. SP - Blade Height (In.) -