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Bard part number 137-442 is an OEM Front Fill used on select Bard wall mounted HVAC units to close off and properly direct airflow at the front of the cabinet, helping the unit maintain the intended air path through the filter and coil section. Replacing a damaged or missing front fill can reduce air bypass, improve filtration performance, and help prevent nuisance issues caused by recirculation or uneven airflow. Because fit can vary by model and cabinet configuration, match 137-442 to your unit model and serial information or the correct Bard parts breakdown before ordering to ensure a direct replacement.