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Bard part number 137-217 is an OEM Return Air Fill used in the return air path on select Bard wall mounted HVAC units to help properly route recirculated air back into the cabinet. A damaged or missing return air fill can contribute to air bypass, reduced airflow across the indoor coil, and uneven comfort, so replacing it with the correct Bard factory part helps restore the designed air pattern and overall system performance. Verify fitment by matching 137-217 to your unit model and parts breakdown before ordering, since return air components can vary by cabinet style and vintage.