... or two floor avilable, fireproof, heat insulation, wind and seismic resistance, economic. 1. Why light gauge steel structure ... antsVentilation: a combination of natural ventilation & air supply keep the indoor air fresh and clean Packing and delivery: One 40'HQ ... gutter, wall panel, floor, window, door, sanitary, kitchen...and full set of instruction... 2.Specifications: (Ⅰ) MAIN STRUCTURELIGHT STEEL ...