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Bard part number 521-411 is a heat exchanger partition assembly used in select Bard wall mounted HVAC units to separate sections within the heat exchanger area. This internal sheet metal component helps maintain proper airflow paths and keeps hot and cool airstreams where they belong, which supports safe, efficient heat transfer and steady unit operation. As an OEM Bard replacement part, 521-411 is built to match original fit and alignment in the equipment, making it a smart choice when a damaged or corroded partition is causing performance issues or service failures. Confirm compatibility by matching your unit model and serial information to the correct parts list before ordering.