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Bard part number 5021-2431 is an OEM insulation component used inside select Bard wall mounted HVAC units to reduce heat transfer, limit cabinet sweating, and help stabilize air temperatures as the system cycles. Properly fitted insulation also supports quieter operation by dampening vibration and airflow noise within the cabinet. Because insulation pieces are often model and revision specific, match 5021-2431 to the unit rating plate or the correct Bard parts list before ordering to confirm exact placement and fit.