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Bard part number 171-109 is an OEM heat exchanger designed for use in Bard H200 gas heating sections, restoring safe and efficient heat transfer between the burner combustion path and the building airstream. If your Bard wall mounted unit is showing signs of exchanger failure such as flame rollout, abnormal odors, or repeated limit trips, replacing the heat exchanger with the correct factory part helps maintain proper airflow temperature rise and combustion performance to Bard specifications. Because heat exchangers are model and capacity specific, confirm the unit model and serial number before ordering to ensure proper fit for your H200 application and to avoid mismatched burner or collector box alignment.