Cold steel, covered with a special primer, provides the maximum level of efficiency of the entire system with a sheet density of 1-2 mm. Professional seam processing guarantees the integrity of the structure, ensuring controlled smoke removal. The rectangular and round section allows you to carry out chimneys in hard -to -reach places and connect more complex structures in a single mesh, in particular in a multi -storey building. The presence of smokehrods and in the underground rooms is vital.