Inline Centrifugal Duct Fan Housing Material Galvanized Steel Fits Duct Dia 12 In. Voltage 120V Max Amps 3 Max Wattage 301 Number of Speeds 1 Housing Dia 16 In. Length 8-15/16 In. Motor RPM 3250 CFM @ Duct 940 CFM @ 0.000-In. SP 940 CFM @ 0.125-In. SP 903 CFM @ 0.200-In. SP 880 CFM @ 0.250-In. SP 865 CFM @ 0.375-In. SP 834 CFM @ 0.400-In. SP 819 CFM @ 0.500-In. SP 783 CFM @ 0.600-In. SP 746 CFM @ 0.750-In. SP 689 CFM @ 0.800-In. SP 670 CFM @ 1.000-In. SP 596