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Bard part number 9043-348 is an OEM heat exchanger assembly used in select Bard wall mounted gas/electric units to safely transfer heat from the burner section into the supply airstream while keeping combustion gases contained. When a heat exchanger is cracked, leaking, or shows excessive corrosion, replacing it with the correct Bard factory assembly helps restore proper heating performance, maintain safe operation, and keep the unit matched to its original design. Because heat exchanger fit and firing configuration can vary by model and input, confirm compatibility by matching 9043-348 to your unit model and serial data or the correct Bard service manual before ordering.