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The Bard 520-189 blower partition assembly is an OEM internal sheet metal divider used in select Bard wall mounted HVAC units to separate the blower compartment from adjacent sections, helping maintain proper airflow routing, component isolation, and overall cabinet integrity. If your original partition is bent, missing, or has been removed during prior service, replacing it with the correct Bard factory part helps ensure the blower delivers air through the intended path and reduces air bypass that can affect system performance. Because partitions are model specific, confirm fit by matching the part number to your unit model and serial information in the appropriate Bard parts manual before ordering.