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Bard part 521-464 is an OEM right partition insulation assembly used inside select Bard wall mounted HVAC units to separate sections of the cabinet and reduce unwanted heat transfer and air bypass between compartments. By restoring the original insulated divider, this part helps protect nearby components, supports proper airflow paths, and can improve overall unit efficiency and temperature control when the original insulation is damaged, missing, or saturated. It is a direct fit Bard replacement intended to match the factory design, so confirm compatibility by model and serial number before ordering to ensure correct application in your specific Bard system.