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The Bard 521-379 Vertical Partition Assembly is an OEM internal sheet metal divider used inside select Bard wall mounted HVAC units to separate compartments, guide airflow, and support proper component layout. A damaged or missing partition can lead to air bypass, vibration, and serviceability issues, so replacing it with the correct Bard part helps restore the unit’s intended internal air paths and structural separation. Confirm fit by matching 521-379 to your Bard model and serial number from the unit data tag or the correct parts list before ordering.