RTK-FS self standing chimney systems are usually used in industrial plants or factories, power plants, waste water or gas treatment plants,petrochemical complex and in places where the boiler room is far from the main building. The chimney is double walled, foundation anchored and stand alone type. The inner walls may be manufactured with continuous welded or flange connected and available to H0 tightness class according to the type of use. Rock wool or ceramic wool insulation is inserted between the walls. It has low thermal conductivity, since the heat of the chimney gas is not considerably transferred to the environment, the chimney efficiency is high. The outer shell are designed in accordance with the static load conditions and made of steel. The shell may be epoxy coated or cladded with stainless steel for protection from atmospheric corrosion. The chimneys may be designed for wet or dry systems up to 1000 °C temperature.