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Bard part number 121Y336 is a left-hand (LH) blower partition used inside the blower section of select Bard wall-mount and packaged HVAC units to separate airflow paths and maintain the correct air direction through the blower assembly. When this partition is bent, rusted through, or missing after a service event, you can see reduced airflow, air bypass, and uneven performance. Replacing it with the correct Bard OEM 121Y336 helps restore proper internal air separation and supports the unit’s designed airflow and efficiency. Confirm left-hand orientation and match the part number to your unit’s model and serial information before ordering to ensure proper fit.