Centrifugal Inline Duct Fan Housing Material Galvanized Steel Fits Duct Dia 12 In. Voltage 120V Max Amps 1.16 Max Wattage 166 Number of Speeds 1 Housing Dia 16 In. Length 9-3/16 In. Motor RPM 2510 CFM @ Duct 750 CFM @ 0.000-In. SP 805 CFM @ 0.125-In. SP 772 CFM @ 0.200-In. SP 780 CFM @ 0.250-In. SP 734 CFM @ 0.375-In. SP 692 CFM @ 0.400-In. SP 750 CFM @ 0.500-In. SP 650 CFM @ 0.600-In. SP 686 CFM @ 0.750-In. SP 556 CFM @ 0.800-In. SP 615 CFM @ 1.000-In. SP 474