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Bard part 169-136 is an OEM HX transition plate used in Bard wall mount HVAC equipment to properly bridge and align sections of the heat exchanger assembly so airflow and heat transfer stay consistent through the furnace compartment. If your original plate is warped, rusted, or damaged during heat exchanger service, replacing it with the correct Bard factory part helps maintain proper fit-up between adjoining components and reduces the chance of air leakage, vibration, or hot spots that can affect performance. As with most sheet metal heat exchanger interface parts, confirm part number compatibility with your unit model and serial number before ordering to ensure the correct match for your specific cabinet and heat section layout.