... design,process, installation fabrication,etc ,and our steel structure building standards come from USA, Austrialia,and ... postH steel structure composed of jointing steel board,Q345or Q235.5Roof girderH steel structure composed of jointing steel board, ... /double door11WindowsPlastic steel windows/Colored steel windows (push and pull,casement,top-hinged window)12Optional accessoriesCeilingMineral ...