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Bard part number 509-182 is a Lower Inner Back Assembly used on select Bard wall mounted HVAC units to rebuild the lower rear internal cabinet area and restore proper support, alignment, and airflow separation behind critical components. If the original inner back is rusted, bent, or damaged from service access or shipping, replacing it with this OEM Bard assembly helps the unit fit together correctly and prevents unwanted vibration and air leakage that can affect performance. Because cabinet assemblies can vary by model and vintage, confirm fit by matching the 509-182 part number to your unit model and serial information before ordering.