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Bard part 169-138 is an OEM HX Transition Plate used inside select Bard wall-mounted HVAC equipment to properly route and seal the transition path at the heat exchanger section, helping maintain correct airflow and heat transfer through the unit. A damaged or missing transition plate can contribute to air bypass, uneven heating performance, and nuisance limit or safety issues, so replacing it with the correct Bard OEM part helps restore the factory-designed internal fit and function. Since this is a fit-specific internal sheet metal component, confirm compatibility by matching the part number to your Bard model and serial number parts list before ordering.