Flue liner
Approved Document J, Combustion appliances and fuel storage systems, 2010 edition incorporating 2010, 2013 and 2022 amendments, defines a flue liner as: ‘…the wall of the chimney that is in contact with the products of combustion, such as a concrete flue liner, the inner liner of a factory-made chimney system or a flexible liner fitted into an existing chimney.’
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