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The Bard S138-203 Exhaust Damper Blade Assembly is an OEM airflow control component used in Bard wall-mount equipment to help regulate building exhaust as part of the unit ventilation and damper system. If your unit is not relieving air properly, has a stuck or damaged blade, or the damper linkage is not moving smoothly, replacing the blade assembly can restore proper air path control and help the system maintain the intended ventilation balance. As a genuine Bard replacement part, S138-203 is built to match the original fit and operation, making it the right choice when you need dependable performance and straightforward serviceability on compatible Bard units.