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The Bard 508-163 Supply Box Back Assembly is an OEM internal sheet metal component used in select Bard wall-mounted HVAC units to complete the rear section of the supply air box, helping form the correct air path from the blower section into the supply discharge. Replacing a bent, corroded, or damaged supply box back can help prevent air leakage, reduce rattles and vibration, and ensure the unit delivers air where it is designed to go. Since Bard uses different cabinet and air box layouts by model and revision, confirm the part number against your unit model and serial number details or the correct Bard parts breakdown before ordering to ensure proper fit.