I have one of these new in the box

The Belimo NMB24-SR is a 24V non-spring return damper actuator designed for HVAC systems. With a compact size of 3.15 inches in width and weighing 2 pounds, this model (NFB24-SR) from Belimo is known for its quality and reliability in controlling the movement of dampers in heating, ventilation, and air conditioning systems. It operates efficiently between 2-10VDC, making it suitable for various commercial and industrial applications in the HVAC sector.