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Bard part 521-430 is an OEM Heat Exchanger Partition Assembly used in Bard wall-mount HVAC equipment to properly separate airflow paths around the heat exchanger so the unit maintains correct temperature rise, safe operation, and steady performance. A damaged or missing partition can contribute to air leakage, uneven heating, nuisance limit trips, and reduced efficiency, so replacing it with the correct factory assembly helps restore the intended internal air sealing and heat exchanger compartment layout. Because partitions can vary by model and vintage, confirm 521-430 against your unit model and serial number (or the Bard parts list for your specific chassis) before ordering to ensure proper fit and alignment during installation.