Propeller Replacement Propeller Dia (In.) 6 in Bore Dia (In.) 1/4 in Number of Blades 5 Pitch (Deg.) 27 Degrees Blade Material Aluminum Keyway (In.) - Number of Set Screws 1 Rotation CW Facing Discharge Required Motor HP 1/100 Required HP @ Higher RPM - RPM Low - RPM High - Max RPM 1550 CFM @ 0.000-In. SP 120 CFM @ 0.125-In. SP - CFM @ 0.250-In. SP - CFM @ 0.375-In. SP - CFM @ 0.500-In. SP - Blade Height (In.) - Blade Width (In.) 1 1/4 in