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Bard part 521-587 is an OEM exhaust partition used in Bard wall mount air conditioner cabinet assemblies to keep the exhaust air path properly separated from other internal airstreams and components. A damaged or missing partition can lead to airflow mixing, heat recirculation, and reduced unit efficiency, so replacing it helps restore the intended air management inside the unit. This partition is designed to match Bard factory dimensions and mounting points for a dependable fit during service work, making it a straightforward replacement when you are correcting airflow separation issues or rebuilding cabinet internals on compatible Bard equipment.