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Bard part S552-445-4 is an OEM vent option door assembly for Bard ERV ventilation packages, used to close and seal the vent opening and provide proper access and airflow control when the ERV option is installed. This door assembly helps keep the ventilation section operating as designed by maintaining fit and alignment at the cabinet opening, which supports consistent outside air management and reduces nuisance air leakage that can occur with damaged or missing doors. When replacing, confirm the part number against your unit model and the ERV option documentation to ensure correct fit for your specific Bard wall mounted system.