The insulated element is designed to change the flue's direction and bypass obstacles during installation. The inner contour is made of 0.5 mm thick AISI 430 stainless steel. Thermal insulation is made of basalt wool, which minimizes condensation and promotes rapid heating of the flue and the system's initial operation. Cold-formed socket joints provide ideal geometry and gas tightness. Laser butt welding ensures a thin and durable seam, significantly increasing the service life. Operating temperature up to 450°C.