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Bard part 9041-031 is an OEM heat exchanger used in Bard IH115D48A, IH115D48B, and IH115D48C gas heating sections, where it transfers heat from the burner flame into the supply airstream while keeping combustion gases isolated from indoor air. A correct, leak-free heat exchanger is critical for safe furnace operation and proper temperature rise, so this is the right replacement when inspection confirms damage, corrosion, or failure of the original exchanger. Because fitment can vary by exact furnace model and serial, verify your unit identification before ordering to ensure the proper match and to avoid installation delays.