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The Bard 539-202 Exhaust Air Deflector Top Assy is an OEM airflow management component used on select Bard wall mount HVAC units to help guide hot discharge air away from the cabinet and adjacent air paths. A damaged or missing deflector can contribute to recirculation, higher head pressure, nuisance high limit trips, or reduced cooling efficiency, especially in tight installations where discharge air can bounce back toward the condenser section. This assembly is built to Bard fit and performance expectations, making it a dependable replacement when restoring proper discharge direction and overall unit operation; confirm compatibility by matching your unit model and serial to the correct Bard parts list before ordering.