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Bard S106-153 is an OEM top fill component used on select Bard wall-mounted HVAC units to close off and properly direct airflow at the top section of the cabinet, helping the unit maintain correct internal air paths and protect critical components from bypass air. Replacing a missing, damaged, or deformed top fill can help restore intended cabinet sealing and overall unit operation, especially after service work or when cabinet panels have been removed. For best fit, confirm S106-153 against your unit model and serial number or the Bard parts breakdown before ordering, since top fill pieces can vary by chassis and production run.