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Bard part number 521-154 is a blower partition assembly used inside select Bard wall mounted HVAC units to separate blower and adjacent cabinet sections and guide air through the proper path. When a partition is bent, rusted through, or missing after service work, airflow can short-circuit inside the unit, which can lead to uneven supply air, reduced performance, and nuisance issues tied to improper airflow across the coil. Replacing the partition with the correct Bard OEM component helps restore the original internal airflow separation and clearances the unit was built around, so the blower and coil section operate as intended. Confirm fit by matching your unit model and serial with the Bard parts list before ordering.