Inline Centrifugal Duct Fan Housing Material Galvanized Steel Fits Duct Dia 8 In. Voltage 120V Max Amps 1.45 Max Wattage 142 Number of Speeds 1 Housing Dia 13-3/8 In. Length 8 In. Motor RPM 2950 CFM @ Duct 502 CFM @ 0.000-In. SP 502 CFM @ 0.125-In. SP 482 CFM @ 0.200-In. SP 470 CFM @ 0.250-In. SP 460 CFM @ 0.375-In. SP 438 CFM @ 0.400-In. SP 428 CFM @ 0.500-In. SP 408 CFM @ 0.600-In. SP 388 CFM @ 0.750-In. SP 360 CFM @ 0.800-In. SP 351 CFM @ 1.000-In. SP 313