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Bard 536-351 is an OEM exhaust blank off plate assembly used in select Bard wall-mount units to cover and seal the exhaust opening when the unit is configured without an exhaust-style vent option. Installing the correct blank off plate helps prevent unwanted outside air infiltration through the vent pathway and keeps the cabinet airflow path consistent with the intended ventilation setup. Because ventilation configurations vary by model and vent package, confirm the part number against your unit’s model and vent arrangement before ordering to ensure proper fit and function.