Collar W/Damper, Duct Fitting Diameter 4 in, Duct Fitting Length 5 in, Width 6 in, Duct Fitting Material Galvanized Steel, 26 Gauge, Collar W/Damper, Height 6 in, Coating Galvanized, 3 in W. G, Standards SMACNA / ASTM, Pre-sealed / Low Leakage Hardware, For Use With Greenseam Duct system. This item has been restricted from sale in the following state (s): []