This OpenAir GBB Series Non-Spring Return Rotary Electric Damper Actuator has an operating voltage of 24 volts AC, an input signal of 0 to 10 volts DC and a torque of 177 pounds per inch. This damper actuator is designed for control of building HVAC dampers and its features include self-centering shaft coupling, quiet operation, acceptance of shaft diameters up to 1" and manual override. This actuator has plenum-rated cable for applications where conduit is not required.