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Bard part number 520-229 is an OEM Upper Partition Assembly used inside select Bard wall mounted HVAC units to separate internal sections so air moves through the correct path and critical components stay properly isolated. When a partition is bent, missing, or leaking around the edges, it can contribute to poor airflow control, recirculation, noise, and reduced system performance, so replacing it helps restore the factory airflow layout and component separation. Because partitions vary by cabinet and chassis design, confirm fit by matching 520-229 to your unit model and serial number in the Bard parts manual before ordering.