Siemens GPC136.1P DAMPER ACTUATOR | SPRING RETURN | 24 VAC/DC | FLOATING | 35 LB-IN | SWSiemens GPC136. 1P Damper Actuator Spring Return 24 VAC DC Floating 35 lb in SWDamper actuator spring return, 35 lb in floating control. 24VAC DC with dual built in auxiliary switches and plenum rated. For use on small control dampers OpenAir GPC Series Electric Damper Actuator, spring return, 35 lb in. For use on economizer dampers and small control dampers Additional Information Actuator TypeSpring return Actuation StyleRotary Control or Fire Smoke