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Bard part number 111-339-8 is an OEM inner sleeve side panel used with select Bard wall mounted HVAC wall sleeve assemblies, helping keep the sleeve structure square, properly aligned, and sealed so the unit seats correctly in the opening and airflow paths remain as designed. This is the correct choice when a sleeve side has been bent, corroded, or damaged during service or removal, since using the matched Bard factory component helps avoid fitment issues that can cause air leakage, vibration, or difficult reinstallation. Verify compatibility by matching the part number to your unit or wall sleeve parts list before ordering.