The OpenAir direct-coupled spring return electronic actuator is designed for modulating two-position and floating control of building HVAC dampers. Used in constant or variable air volume installations for the control of return air, mixed air, exhaust, and face and bypass dampers requiring up to 62 lb-in (7 Nm) torque.  Designed for applications that require the damper to return to a fail-safe position when there is a power failure. Features: Brushless DC motor technology with stall protection Bi-directional fail-safe spring return Models available with dual, independently adjustable auxiliary switches Unique self-centering shaft coupling Manual override Available in 62 lb-in torque 5-degree preload as shipped from factory Mechanical range adjustment capabilities UL and cUL listed, CE certified 24 Vac/dc compatible