Centrifugal Inline Duct Fan Housing Material Galvanized Steel Fits Duct Dia 6 In. Voltage 120V Max Amps 1.00 Max Wattage 74 Number of Speeds 1 Housing Dia 13-1/8 In. Length 9 In. Motor RPM 2480 CFM @ Duct 330 CFM @ 0.000-In. SP 363 CFM @ 0.125-In. SP 344 CFM @ 0.200-In. SP 349 CFM @ 0.250-In. SP 323 CFM @ 0.375-In. SP 305 CFM @ 0.400-In. SP 330 CFM @ 0.450-In. SP 295 CFM @ 0.500-In. SP 287 CFM @ 0.600-In. SP 302 CFM @ 0.750-In. SP 247 CFM @ 0.800-In. SP 271