This flexible stainless steel chimney liners system is the perfect solution for renovating existing concrete chimneys, especially in cases where because of their curvature cannot be installed rigid flue liners. System is designated to exhaust combustion products by natural draught (n1) from heating appliances, which use gas, liquid or solid fuel. The system is soot fire resistant (g), it is designated for wet operating (w) and its maximal working temperature is 600 °c (t600). Liner inner wall is smooth, made from acid-resistant stainless steel strip thickness 0.10 mm (steel grade 1.4404 according en 10088). Outside wall is corrugated, made from stainless steel strip grade en 1.4404 or en 1.4301.