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The Bard 501-422-4 is an OEM side assembly used on select Bard wall-mounted HVAC units to restore the unit cabinet structure and maintain proper panel alignment for safe, reliable operation. This replacement side assembly helps protect internal components from jobsite wear while supporting correct airflow routing and service access the way the original cabinet was built. For best results, confirm the exact part number match to your Bard model and serial number before ordering, since side assemblies can vary by unit family and cabinet configuration.