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Bard part number 509-437 is an OEM Back Assembly service replacement used on Bard wall mounted HVAC equipment to restore the rear section structure and proper cabinet fit where multiple rear components mount and seal. Replacing a damaged or corroded back assembly helps maintain correct airflow separation and supports reliable operation by keeping key sections aligned so panels, partitions, and related hardware fit as intended. As with any cabinet assembly, confirm your unit model and serial information against the Bard parts list before ordering to ensure the correct fit for your specific wall mount unit.