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Bard part 137-464 is an OEM rear fill piece used on select Bard wall mounted HVAC units to close off and support the rear cabinet area and help maintain proper internal airflow separation through the equipment. When this fill panel is missing, bent, or damaged, you can end up with air bypass, vibration, and poor cabinet fit that makes other service work harder. Replacing it with the correct Bard 137-464 helps restore the intended cabinet layout so your unit can operate and service like it was designed, and it is a direct-fit Bard replacement part that should be verified against your model and serial number before ordering.