This direct-coupled damper actuator is used in air damper, ventillation flaps, louvers and vav-units. These actuators can also be used for fire and smoke control applications.Available in various torque ratings to suit different sizes of damper areacontrol signal on-off spst, spdt, floating and modulating controlmaximum operating temperature of 176 degree celcius for fire and smoke control modelsmanual operationprotection class ip54