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Bard part number 553-379-1 is an OEM lower door assembly in white used on select Bard wall mounted HVAC units to close off and protect the lower service area while still allowing quick access for inspection and maintenance. Replacing a damaged or missing lower door helps keep internal components shielded from weather and jobsite debris, supports proper airflow management around the cabinet, and restores the unit’s original fit and serviceability. Confirm compatibility by matching the part number to your Bard model and serial information before ordering, since door assemblies can vary by cabinet size and series.