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Bard part number 171-104 is an OEM heat exchanger specified for Bard IH85 and IL85 gas furnace models, designed to safely transfer heat from the burners into the supply airstream while keeping flue gases contained. If your furnace shows signs of a cracked or leaking heat exchanger, such as abnormal odors, soot, rollout, or failed combustion checks, replacing the heat exchanger is a critical repair for both safety and reliable heat output. Because heat exchanger configurations can vary by furnace series and revision, confirm your exact unit model and serial number against the appropriate Bard parts documentation before ordering to ensure proper fit and venting alignment.