Product features;• Without Spring ReturnTorque: 20 Nm• Effective Valve Size: 4 m²Control Type: FloatingVoltage: 230VAuxiliary Contact: NoAs part of energy and cost reduction applications in ventilation systems, damper motors are used to open and close dampers . Damper motors of different powers can be used depending on the size of the damper as well as the air flow rate. Depending on the application, the motors that can be controlled on / off, floating or proportionally have 24V and 230V options.