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Bard part number 121Y182 is an OEM blower partition used inside the blower section of select Bard wall-mount HVAC units to separate and direct airflow through the correct passages. A properly fitted partition helps the blower move air efficiently across the intended components, supporting consistent supply air performance and reducing the chance of internal air bypass that can lead to comfort complaints. Because this is a fit-critical internal sheet metal piece, match the part number to your unit model and serial before ordering to ensure proper alignment in the blower compartment and an OEM-correct replacement.