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Bard part 521-433 is an OEM partition assembly used inside select Bard wall-mounted packaged air conditioners and heat pumps to separate compartments and guide airflow the way the unit was engineered to run. Partitions like this help prevent air bypass, keep critical components properly isolated, and support correct air path routing across coils and through the cabinet, which protects performance and reliability. Because partitions can vary by unit series and revision, match 521-433 to your Bard model and serial number and confirm placement using the unit parts breakdown before ordering.