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Bard part 137-370 is an OEM Econ Front Fill used on Bard wall mount HVAC units equipped with an economizer, helping close off and finish the front opening around the economizer section so outside air and return air are directed through the correct path. If your unit has been serviced and a fill piece is missing, bent, or not sealing correctly, replacing it with the correct Bard 137-370 helps restore proper airflow management, reduces bypass air, and supports stable economizer performance. As with most fill and closure components, confirm fit by matching your unit model and serial information to the Bard parts list for the specific configuration before ordering.