The flue liner has a smooth inner liner made from 316L grade stainless steel and is 0.12mm thick. The flue liner has a convoluted outer skin made from 316L stainless steel and is 0.12mm thick. The Flue Liner is constructed from a single strip of steel which is bent at 180 degrees and then the seam is folded in four planes to give a quattrolock seal.
