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Bard part 509-231 is an OEM back assembly used in Bard wall mounted packaged HVAC units, providing the rear cabinet structure that supports proper panel alignment and helps maintain correct internal airflow separation and component protection. This back assembly is typically referenced in Bard replacement parts manuals under cabinet components, making it a fit critical item when the original back section is damaged from handling, corrosion, or impact. Verify your exact unit model and series to confirm the correct back assembly callout before ordering, since similar Bard models may use alternate back assemblies that look alike but mount differently.