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Bard 8602-050 is an OEM 24 VAC damper motor used on Bard wall-mount HVAC ventilation and economizer assemblies to drive the outdoor air damper as the control board calls for more or less fresh air. If your unit is not modulating outdoor air correctly, sticks in one position, or fails economizer operation, replacing the actuator with the correct Bard part number helps restore proper airflow control and reliable damper movement. As with most damper actuators, confirm your unit model and economizer or ventilation option, then verify wiring and shaft or linkage alignment during installation so the damper fully opens and closes as intended.