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The Bard 521-400 Blower Partition Assembly is an OEM internal sheet metal component used in many Bard wall-mounted HVAC units to separate the blower section from adjacent compartments, helping keep airflow routed correctly through the cabinet and reducing air bypass that can hurt comfort and system performance. Replacing a bent, rusted, or missing partition helps restore proper air movement across the indoor components and supports consistent operation under normal service conditions. As a genuine Bard replacement part, 521-400 is built for the fit and clearances Bard equipment requires, so confirm your unit model and serial information before ordering to ensure correct application.