1,For operation of air control dampers in HVAC system 2,Torque:8Nm,16Nm,24Nm ... 16mm Dimension : 100(L) x 180(H) x 67.3(W) mm Housing : ABS engineering plastic Ambient temperature : Operation: -20 - 50 ... set angle. Refer to manual to set the angle.Picture Air Damper Actuators