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Bard S553-637 is an OEM hood mount door assembly made of aluminum, used on Bard wall mounted HVAC units equipped with a fresh air economizer or free cooling hood. This door mounts to the hood and helps protect the hood opening while maintaining proper access and airflow control where the hood components, filters, and internal sections are serviced. Using the correct Bard factory door assembly helps ensure the hood fits and functions as intended with the rest of the hood hardware and related door and filter components, so match your existing hood configuration and verify the part number against your unit and hood parts list before ordering.