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Bard part number 171-107 is an OEM heat exchanger used in Bard IH115 and IL115 series gas furnace packages, where it transfers heat safely from the burner section into the supply airstream while keeping combustion byproducts separated from indoor air. If your unit has a cracked or failed exchanger, replacing it with the correct Bard factory part helps restore proper heat output, reliable ignition and draft performance, and safe furnace operation. Because heat exchanger configurations can vary by model and serial range, confirm fitment by matching 171-107 to your unit data plate and the applicable Bard parts manual before ordering.