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The Bard 501-751-4 is an OEM plenum right side assembly used on select Bard wall mounted HVAC systems to restore the correct airflow path and keep the plenum section properly sealed and supported. If the original side section is bent, rusted through, or compromised around fasteners or seams, replacing it helps prevent air leakage, improves duct connection integrity, and keeps the unit operating the way it was engineered to. Because plenums and cabinet assemblies can vary by model series and tonnage, match this Bard part number to the unit model and serial information or the parts list before ordering to ensure proper fit.