There are two grades of stainless steel flexible liner – 316L and the more expensive 904L grade. However, there is nothing in Building Regulations Technical Booklet L which stipulates that you should use a particular grade for solid fuel stove applications. Further, HETAS recently stated "HETAS do not perceive the benefits of the 904 grade of liner to be greater than those of 316; so long as installation, maintenance and use of the liner / appliance is within guidance supplied by the manufacturer / user instructions, both are accepted as suitable".
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