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Bard part number S120-270 is an OEM internal coil partition used inside select Bard wall mounted and package style HVAC units to separate coil sections and guide air through the correct path across the heat exchanger surfaces. When a partition is bent, missing, or improperly sealed, it can allow air bypass that reduces sensible capacity and can contribute to uneven coil loading, icing, or nuisance moisture carryover. Replacing the partition with the correct Bard OEM fit helps restore proper airflow management, coil performance, and serviceability during coil or cabinet repairs, and it is a smart add on when you already have the unit open for major maintenance.