Propeller Replacement Propeller Dia (In.) 6 3/4 in Bore Dia (In.) Hubless Number of Blades 5 Pitch (Deg.) 30 Degrees Blade Material Aluminum Keyway (In.) - Rotation CW Facing Discharge Required Motor HP 1/200 Required HP @ Higher RPM - RPM Low - RPM High - Max RPM 1550 CFM @ 0.000-In. SP 180 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 5/8 in