This document introduces the heating, ventilation, and air conditioning products of Siemens Building Technologies, particularly the CM2N4634Cn model of the OpenAirTM damper actuator. The actuator has a rotary stroke and works with AC 24 V / AC 230 V power supply, suitable for three-point floating and modulating control. It has a nominal torque of 5 Nm (GBB), 10 Nm (GIB), or 2 Nm (GSF), with a mechanical adjustable range of 0.90°. Additionally, the actuator is available with various optional features, including position signal, valve position indicator, feedback potentiometer, adaptive rotation angle range, and adjustable auxiliary switches. For detailed instructions and installation information, please refer to the basic document Z4634.