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Bard part number 5021-1689 is an OEM insulation piece used inside select Bard wall mounted HVAC units to help reduce cabinet heat transfer and vibration related noise while protecting nearby components from temperature swings. Replacing worn, torn, or oil soaked insulation can improve system efficiency and prevent rattles that develop over time, especially in high run time installations like telecom and modular buildings. Because insulation placement and thickness vary by model and production run, confirm 5021-1689 against your unit model and serial number in the correct Bard parts manual before ordering to ensure proper fit and coverage.