Johnsons Control M9108-GGA-1N (Was Joventa DMS1.1) 24VAC 8Nm Rotary Electric Damper Actuator.
The M9108 series electric actuators are direct-mount actuators. These bidirectional actuators do not require a damper linkage, and are easily installed on round shafts or square shafts using the standard shaft clamp included with the actuator. A single M9108 series electric non spring return actuator provides 8 Nm torque depending on the model. M9108 series actuators provide 90° of rotation. A graduated scale from 0° to 90° and a position indicator provide visual indication of stroke.
YOU CAN ALSO USE THE ELECTRO CONTROLS E08-24M - LINK HERE