Steel door noise made from steel, Zinc, 1.5 1.6 mm thick Electro Gavanize. connecting auxiliary plate 2 mesh, steel structures with Stiffener for added strength .
Steel doors soundproofing Steel Zinc Electro Gavanize thickness 1.5, 1.6 mm. Splice connecting two sheets of steel structures with Stiffener reinforced to increase rigidity.
Steel doors sound produced from iron Zinc Electro Gavanize, thick 1.5 1.6 mm. Mesh connected 2 sheet reinforced steel structures Stiffener strengthens to