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The Bard 520-165 Upper Partition Assembly is an OEM internal sheet metal divider used in select Bard wall mount HVAC units to separate compartments and maintain the correct airflow path through the cabinet. A properly fitted partition helps prevent air bypass and keeps sensitive components isolated as designed, which supports stable performance and serviceability after a repair. If your existing partition is damaged, rusted through, or missing due to prior work, replacing it with the correct Bard 520-165 assembly helps restore the factory layout and proper internal clearances. Confirm compatibility by matching your unit model and serial data to the correct parts list before ordering.