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Bard part number 508-150 is the Supply Box Back panel used on Bard wall mount HVAC applications to close in and support the supply air box assembly where conditioned air transitions from the unit to the duct connection. Replacing a bent or corroded back panel helps restore proper fit-up of the supply box, reduces air leakage paths that can hurt airflow and efficiency, and keeps the installation properly enclosed for service access and long-term durability. As an OEM Bard replacement part, 508-150 is intended to match the original geometry for straightforward alignment with the existing supply box and adjoining components; verify your unit model and supply box configuration to confirm compatibility before ordering.