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The Bard 521-566 Adapter Partition Assembly is an OEM internal sheet metal partition used in Bard wall-mounted air conditioners and heat pumps to separate sections inside the unit and maintain proper compartment layout for airflow management and service access. A correct partition fit helps keep air paths and component clearances as designed, which supports stable operation and reduces the chance of air bypass, rattles, or interference with nearby assemblies. Use Bard 521-566 when replacing a damaged or missing internal divider so the unit can be reassembled to factory configuration; verify compatibility by matching your model and serial number to the Bard parts list before ordering.