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Bard part number 9043-342 is an OEM heat exchanger assembly (manufacturer reference 4016003) used in Bard wall mounted gas/electric equipment to transfer heat safely and efficiently from the burner section into the supply airstream. When a heat exchanger is cracked, rusted through, or leaking flue gases, replacing it with the correct Bard factory assembly helps restore proper combustion airflow, dependable heating output, and safe operation. Because heat exchangers can vary by unit series, BTU input, and burner count, confirm compatibility using your Bard model and serial number or the applicable Bard parts manual before ordering to ensure the 9043-342 assembly matches your exact unit.