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Bard part number 171-100 is an OEM heat exchanger used in Bard wall-mounted gas heating sections for C60 and C80 equipment, where it transfers heat from the burner into the supply airstream while keeping combustion byproducts separated from the conditioned air. Replacing a damaged or leaking heat exchanger helps restore safe, reliable heat output and proper furnace performance, especially when troubleshooting symptoms like flame rollout, abnormal odors, repeated limit trips, or visible corrosion in the heat cell area. Because heat exchangers are model and revision specific, confirm the exact unit model and serial number and match the original part number before ordering to ensure correct fit, alignment with the collector and inducer components, and proper connection to existing safety controls.