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Bard part number 508-139 is the Supply Box Back used on select Bard wall mounted HVAC units to close off and support the rear portion of the supply air box, helping maintain proper airflow routing and protecting internal duct connections. As an OEM Bard sheet metal component, it is built to match factory fit and hole alignment so it installs cleanly during service repairs or when replacing damaged cabinet sections after a removal or retrofit. Confirm compatibility by matching your unit model and serial information to the correct Bard parts list before ordering, since supply box configurations can vary by unit family and vintage.