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Bard part number 9043-013 is an OEM heat exchanger assembly used in Bard wall mounted gas heating equipment to safely transfer heat from the burner side into the supply airstream while keeping combustion gases isolated from occupied spaces. This 140M, 5 section heat exchanger is a critical mechanical component for restoring proper heating output and dependable furnace operation when the original exchanger is damaged, leaking, or fails inspection. For the best fit and safe performance, match the part number to your unit model and serial information and confirm required gaskets, hardware, and setup details in the correct Bard service literature before installation.