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Bard part S109-422 is an OEM lower back cabinet panel used on select Bard wall-mount air conditioner cabinets, restoring the proper rear lower enclosure that helps protect internal components and maintain correct cabinet alignment and airflow pathways. The manufacturer lists this service part as a stainless lower back, making it a common choice for corrosion-prone applications or units originally built with stainless cabinet sections. Use this replacement when the existing lower back panel is damaged, rusted, or missing, and verify fit by matching the full part number to your unit model and serial information before ordering.