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Bard part number 131-137 is an OEM filter partition used in select Bard wall mount air conditioners and heat pumps to separate the filter section from the rest of the air path and keep the filter properly located so return air is forced through the media instead of bypassing around it. A damaged or missing partition can lead to poor filtration, reduced airflow control, and dirt buildup on the indoor coil and blower, so replacing it helps restore correct air routing and protect internal components. Verify fit by matching the part number to your Bard unit model and serial documentation before ordering, since filter compartment layouts vary by series and vintage.