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Bard part 8602-118 is an OEM direct coupled actuator used to drive damper movement in compatible Bard wall mount and economizer ventilation assemblies, helping the unit modulate outside air and return air as commanded by the control system. A direct coupled design mounts to the damper shaft for consistent, repeatable positioning, which is critical for proper ventilation control and stable mixed air operation. When an actuator fails you may see stuck dampers, improper ventilation, or economizer issues, so replacing with the correct Bard OEM actuator helps restore factory fit, wiring compatibility, and dependable damper response. Verify voltage, control signal, and mounting style against your Bard model and parts list before ordering to ensure proper application.