Siemens GPC131.1P DAMPER ACTUATOR | SPRING RETURN | 24 VAC/DC | FLOATING | 35 LB-INSiemens GPC131. 1P Damper Actuator Spring Return 24 VAC DC Floating 35 lb inDamper actuator spring return, 35 lb in floating control. 24VAC DC plenum rated. For use on economizer dampers and 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 TypeControl Damper