Designed for control of building HVAC dampers, the OpenAir GBB Series Direct‑coupled 24 VAC Non‑spring Return Electronic Damper Actuators are available in 0 to 10 VDC and floating control. The OpenAir GBB Series Damper Actuators are used in constant or variable air volume installations for the control of return air, mixed air, exhaust, and face and bypass dampers that require up to 221 lb.‑in. (25 Nm) torque. Models are available with either an appliance cable for wiring in conduit or a plenum‑rated cable for applications where conduit is not required.