Multi-Unit Job Pack Housings/Duct Collars, Volts:115-120, Hertz:60, Phase:1, Amps:2(Max), CFM:50-70 Depending on Which Fan is Used, Duct Size:3", Material:Galvanized Steel, Not for Use Over Tubs or Showers, Part Dims:3 3/4"H X 8 1/8"W X 10 3/4"D, Part Weight:2 Lbs, In Mfg Box, Made In USA.Can Be Used With SCL 184812 for Fan Model 503 or 507, Sold as 6 Per Box