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904/316 Grade 6″ Flexi Flue
High Grade 904/316 Flexi Flue liners available in metre packs or full installation kits, 904/316 Grade refers to the putridity of the stainless steel.
The flue pipe is constructed from 2 strips of metal crimped together continually to form a pipe with the lower grade 316 on the out and the higher 904 grade on the inside. Although the pipe is corrigated on the outside it is smooth on the inside (This is is tell tale difference in the solid fuel pipe versus the gas and oil variant)
The 316 grade is commonly use in the marine sector due to it high resistant to corrosion and 904L is an austenitic stainless steel. In comparison to 316L, its molybdenum addition gives it superior resistance to localized attack and pitting which is a common cause of failures in 316 grade flue pipe.