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The Bard 120-397 Blower Partition is an OEM internal sheet metal divider used in select Bard wall mount air conditioners and heat pumps to properly separate the blower section from adjacent cabinet compartments, helping maintain correct airflow paths and preventing air bypass that can reduce comfort and efficiency. A damaged or missing partition can contribute to poor airflow, recirculation, and inconsistent temperature control, so replacing it with the correct Bard part helps restore the unit’s intended air sealing and compartment separation. Because fit can vary by model series and vintage, confirm 120-397 against your unit’s model and serial number or the applicable Bard parts manual before ordering.