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Bard part number 5021-2238 is an OEM insulation component used inside select Bard wall-mount HVAC equipment to help separate hot and cold sections, reduce cabinet heat transfer, and limit vibration and airflow noise that can occur when insulation is missing or damaged. Replacing worn insulation helps the unit maintain intended temperature control and protects nearby components from unnecessary heat exposure. Because Bard uses different insulation shapes and placements by model and vintage, confirm fit by matching 5021-2238 to your unit model and serial information before ordering to ensure the correct piece for the original factory layout.