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Bard part 509-207 is an OEM back assembly with a top outlet used on select Bard wall mount HVAC units to form the rear air path and support proper discharge routing where the supply leaves from the top. This component is a key structural sheet metal piece that helps maintain correct airflow alignment and cabinet integrity, which reduces air leakage and fitment issues that can show up with field-fabricated substitutes. Use the unit model and serial number to confirm the correct configuration before ordering, since back assemblies can vary by outlet style and cabinet layout.