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Bard S120-400 is an OEM blower partition assembly used inside Bard wall-mounted HVAC equipment to separate the blower section from adjacent compartments and help maintain the correct airflow path and internal air sealing for proper unit performance. This internal sheet metal partition supports correct blower operation by keeping supply and return air where it belongs, reducing air bypass and helping the system deliver rated airflow across the coil. Replace a bent, rusted, or damaged partition to restore factory fit and prevent airflow issues that can contribute to comfort complaints, coil icing, or nuisance service calls, and always match the part number to the unit model and serial for exact fit.