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Bard part S552-458 is an OEM vent option door assembly used on compatible Bard wall mounted HVAC units to support the factory ventilation option, helping the unit open and close the fresh air path as designed. This stainless door assembly is built to fit the vent opening correctly so airflow and cabinet sealing remain consistent, which helps prevent unwanted air leakage and keeps ventilation performance predictable. It is a direct replacement choice when the original vent door is damaged, corroded, or no longer closing tightly. Confirm compatibility by matching your Bard model and serial number and the unit parts list before ordering.