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Bard 507-250-4 is an OEM top outlet assembly used on Bard wall-mount HVAC units that discharge supply air out the top of the cabinet, helping route airflow correctly into the connected duct or plenum. Replacing a damaged or missing top outlet assembly helps prevent air leakage and recirculation at the discharge opening, which can reduce comfort and system efficiency, and it restores the proper cabinet-to-duct fit intended by Bard. As a genuine Bard part, 507-250-4 is built for direct replacement on compatible models, so the best practice is to confirm the part number against your unit model and serial information before ordering.