LMB24-MFT | Belimo | Damper ActuatorLMB24 MFT Damper Actuator, multifunctional control 24V non spring return For proportional modulation of dampers in HVAC systems. Actuator sizing should be done in accordance with the damper manufacturers specifications. The actuator is mounted directly to a damper shaft from 1 4 up to 5 8 in diameter by means of its universal clamp. Shafts up to 3 4 diameter can be accommodated by an accessory clamp. The default parameters for 2 to 10 VDC applications