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Bard part 109-170-4 is an OEM back panel used on compatible Bard exterior wall mounted HVAC units to restore proper cabinet coverage and support correct airflow separation inside the unit. As a direct replacement cabinet component, it helps protect internal refrigeration and electrical sections from weather exposure and helps reduce air leakage that can impact performance. Install it in the original back panel location and verify fit by model and serial number before ordering, since panel geometry and mounting holes can vary by unit series and production run.