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The Bard S109-169-4 Back Assembly is an OEM rear structural assembly used on select Bard wall-mount HVAC units to restore proper cabinet alignment and provide solid support for rear-mounted components and service panels. This replacement is a good fit when the original rear section is bent, corroded, or damaged from handling or rooftop exposure, since cabinet integrity affects airflow paths, weather sealing, and long-term reliability. Because back assemblies can vary by model family and vintage, match S109-169-4 to your unit model and serial information or the correct Bard parts list before ordering to ensure proper fit and hole pattern alignment.