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Bard part number S109-170-4 is an OEM back assembly used on select Bard wall mounted HVAC units to restore proper rear cabinet structure and support for internal components. As a factory correct replacement, this assembly is intended to match the original fit points so the unit can be secured and aligned correctly after cabinet damage, corrosion, or service work that requires back section replacement. Because back assemblies can vary by model series and vintage, confirm compatibility using your unit model and serial number before ordering to ensure the right match for your specific Bard equipment.