ATAI Round Ductworks available with single and double wall, it comes with multi longitudinal types; Spiral, Straight Seam, and welded. Circular duct manufactured in accordance with SMACNA & DW144 standards and can be constructed from Galvanized steel, Stainless steel, Carbon and Aluminium, with thickness starting from 0.4mm to 0.3mm. Also the duct can be painted with the desired color.