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Bard part 171-176 is an OEM service heat exchanger used in Bard FC085 oil furnace applications to restore safe, efficient heat transfer when the original exchanger is damaged, leaking, or fails inspection. As the core component that separates combustion gases from the air moved through the duct system, a correct heat exchanger match is critical for proper draft, temperature rise, and reliable furnace operation. This replacement is intended to fit the FC085 series it is specified for, helping return the unit to factory-intended performance when installed and verified by a qualified technician using the unit model and serial information.