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Bard part number 521-071 is an OEM vertical partition used inside select Bard wall mounted air conditioners and heat pumps to separate internal sections of the cabinet and guide proper airflow across key components. This divider helps keep air paths organized so the unit can maintain intended performance and reduce recirculation or air bypass that can lead to nuisance issues after service work. If your original partition is bent, rusted through, or missing after a major repair, replacing it with the correct Bard 521-071 partition helps restore proper internal separation and fit within the unit as designed. Confirm compatibility by matching your unit model and serial to the Bard parts list before ordering.