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Bard part number 171-175 is an OEM heat exchanger designed for Bard IH60 gas furnace equipment, replacing the core heat transfer section that moves combustion heat into the airstream while keeping flue gases isolated from indoor air. When a heat exchanger is cracked, restricted, or failing inspection, replacing it with the correct Bard factory part helps restore safe heating operation, proper temperature rise, and dependable burner performance without guesswork on fitment. Because IH-series furnaces can vary by revision and configuration, confirm your exact unit model and serial number against the Bard parts literature before ordering to ensure this 171-175 heat exchanger matches your furnace assembly and related gaskets or hardware you plan to reuse.