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Bard part number 521-558-4 is a lower condenser partition assembly used in the condenser section of select Bard wall mounted HVAC units to separate airflow paths and support proper fan and coil performance. This internal sheet metal component helps maintain the designed air movement through the condenser coil, reducing the chance of recirculation and performance loss that can occur when partitions are damaged or missing. If your unit has been serviced after impact damage, corrosion, or heavy vibration, replacing the partition with the correct Bard OEM part helps restore factory fit and keeps the condenser compartment properly organized for reliable operation.