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Bard part number 121Y480 is an OEM left-hand (LH) blower partition used inside select Bard wall-mounted HVAC units to separate the blower section from adjacent compartments and keep airflow moving through the intended path. A damaged or missing partition can contribute to air bypass, reduced airflow performance, and uneven temperature control, so replacing it helps restore proper internal air management and supports correct blower operation. Because this is an internal sheet metal component, fit is model-specific, so confirm 121Y480 against your Bard unit model and parts list before ordering to ensure the correct LH partition for your configuration.