Mild Steel made Acoustic Treated Duct is used to prevent noise breakout from an air inlet or outlet of a plant room, building or enclosure while allowing ventilation air transfer. The Acoustic Treated Duct has varying acoustic performance depending on the type of aerodynamically designed blades used and the depth of the acoustic louver demanded by the design. The Acoustic Treated Duct is made using mild steel and then finished in enamel paint or powder coated. Mild Steel made Acoustic Treated Duct provides weatherproofing and air transfer.