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The Bard S139-295 Damper Blade Assembly is an OEM airflow control component used in Bard wall-mount HVAC equipment to open and close the damper section so the unit can properly manage outside air, ventilation, and free cooling operation (where equipped). Replacing a bent, sticking, or worn damper blade assembly helps restore correct air mixing and prevents comfort and control issues caused by improper damper movement. Use the part number S139-295 to confirm compatibility with your specific Bard model and serial range before ordering.