Siemens GND221.1U

The OpenAir direct-coupled, 2-position, spring return electronic damper actuators are UL listed for smoke control dampers or for combination fire/smoke rated dampers. Actuators are designed to operate reliably in smoke control systems requiring Underwriter’s Laboratories, Inc. UL555/555S rating when tested as an assembly with the damper and will meet requirements of UBC for 15 second opening and closing at 350°F (177°C).