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The Bard 543-220 Exhaust Blank Off Plate is an OEM cabinet component used on Bard wall mount air conditioner models that utilize the fresh air and exhaust openings, helping you seal off the exhaust port when the unit is configured without an exhaust connection or when converting ventilation options. Installing the correct blank off plate helps prevent unwanted outside air infiltration, reduces drafts and moisture entry, and keeps the ventilation section properly closed so the unit can operate as intended. As with any Bard fitment-sensitive cabinet part, confirm compatibility by matching your unit model and serial information to the correct parts list before ordering.