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The Bard 8602-108 on off actuator is an OEM damper actuator used on Bard wall mounted HVAC equipment to drive a crankarm style linkage and open or close an air damper during ventilation and economizer operation. Rated at 22 inch pounds of torque, it is built to move the damper reliably and return correct outside air control when a weak motor, stripped gears, or inconsistent damper movement causes comfort or airflow issues. For best results, confirm your unit model and damper assembly match, and verify the required torque and stroke before ordering so the actuator fits and cycles correctly.