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Bard part 509-399 is an OEM back assembly used on select Bard wall mounted HVAC units to restore the rear structural section of the cabinet that supports and aligns internal components. When the back section is damaged, corroded, or distorted, replacing it helps the unit sit square on the wall sleeve or mounting surface, keeps airflow paths properly sealed, and supports service access and component fitment the way Bard intended. As a genuine Bard replacement, 509-399 is built to match the original mounting points and clearances so your technician can reassemble the unit with proper panel alignment and reliable long term operation. Confirm compatibility by matching the full model and serial information from your Bard nameplate to the correct parts list before ordering.