An improved design of heat exchanger for recovering heat from waste ducts has heat exchanger ducts (5) positioned inside a flexible mat (3) laid into the bottom of a waste duct and connected into a meandering flow pattern between inlet and outlet connections. Profiled edges (6) of the mat prevent step profiles and ensure a minimum of flow resistance. The mat is part of a flexible tube (14) which forms a liner inside the duct. The mat is produced in a continuous form cut into selected lengths and fitted with end pieces to form the meandering flow pattern and to fit the connectors.
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