In case of fire if the smoke and heat are discharged to atmosphere in a controlled manner, fire-fighters can work more comfortly in rescuing, cooling and extinguishing processes. Static of structure will not be distorted by preventing accumulated heat to effect to structural components. In single-storey buildings, indoor parking garages, underground transportation systems, dome architectures and big shaft and elevator well without positive pressurization, accumulation of heat and smoke in the upper altitudes happens very quickly. If smoke and heat won’t discharged with dampers, smoke collapses down and spreads horizontally and steel structure carriers’ properties deteriorate.
