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The Bard 521-428 Heat Exchanger Partition Assy is an OEM internal sheet metal component used in select Bard wall-mount HVAC units that incorporate a heat exchanger section. This partition helps separate and direct airflow through the proper passages, supporting correct heat exchanger performance and keeping the cabinet interior organized the way Bard designed it. If your existing partition is damaged, missing, or distorted from service work or heat exposure, replacing it with the correct Bard 521-428 assembly helps restore proper airflow separation and fit-up inside the heater compartment. Confirm compatibility by matching the part number to your unit model and serial information or the Bard parts list before ordering.