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Bard 520-164 Upper Partition Assembly is an OEM internal sheet metal divider used inside select Bard wall mounted HVAC units to separate the upper section and maintain the correct airflow path and component isolation. A proper partition helps the unit operate as designed by preventing air bypass, reducing recirculation, and supporting consistent temperature and pressure conditions across coils and fan sections. If a partition is bent, rusted, or missing after service work, replacing it with the correct Bard 520-164 assembly helps restore factory fit, quieter operation, and dependable performance. Confirm compatibility by matching your unit model and serial number to the Bard parts list before ordering.