Actuator, Valve Application Damper, Signal Type Proportional, Rated Torque 35 in-lb, Input Voltage 24V AC, Electrical Connection Type Hardwired, For Use With Building Automation Systems Building Automation System Compatible, NEMA Rating 2, IP Rating IP42, Spring Return Non-Spring Return, Time to Close 30 sec, Shaft Type Self-Centering Clamping, Shaft Rotation CW/CCW, Stroke Degree 93 Degrees , Mounting Type Direct Mount, Maximum Operating Temperature 140 Degrees F Designed to position balancing, control, round, and zone dampers in HVAC systems. This non-spring return electric actuator is also designed to position blades in a VAV box, or it can be used in VVT 2-position zone applications. Long life brushless synchronous drive motor technology helps provide constant running time independent.