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Bard part number 543-101 is a compressor enclosure back assembly used on select Bard wall mounted HVAC units to help form the compressor sound and protective enclosure. This OEM enclosure back piece supports proper fit-up of the surrounding enclosure panels and helps shield the compressor area from airflow disruption and jobsite debris, which is important for reliable operation and service access. Because enclosure components can vary by unit series and revision, confirm 543-101 against the unit model and serial number or the correct parts breakdown before ordering to ensure an exact match.