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Bard part number 521-420 is an OEM condenser partition assembly used in the condenser section of select Bard wall-mounted HVAC units to separate air paths and help the condenser fan move air across the coil the way the unit was engineered. A damaged or missing partition can contribute to poor heat rejection and higher operating temperatures, so replacing it helps restore proper airflow management inside the condenser compartment. This 521-420 partition assembly is intended for exact-fit service replacement, and confirming your unit model and serial with the Bard parts breakdown is the best way to ensure correct application before ordering.