Belimo HVAC damper actuators are designed for use in a wide variety of on/off, modulating or communicating damper and life safety applications. With a comprehensive torque range (18 in-lbs to 360 in-lbs), and the ability to direct mount on standard damper shafts or jackshafts, these solutions are ideal for air handlers, economizer units, VAV terminal units, fan coil units, unit ventilators iary contact, or a manual switch. The actuator is mounted directly to a damper shaft from 1/4" up to 1/2" in diameter by means of its universal clamp, 1/2" enclosure must be used to shield the actuator (See Belimo Mechanical Acces-soriess). 2. For new construction work, order dampers with extended shafts. Instruct the installing contractor to allow space for mounting and service of the Belimo actua-tor on the shaft. 3. For standard mounting, the damper shaft must extend at least 3 1/2" from the duct. Downloads CAD Models, MSDS, Manuals Belimo TFB120-SR : 22 in-lb Spring Return Damper Actuator Belimo LMB24-3.1 : Non-Spring Return Damper Actuator $54.73. Eisco Labs Push Pull Balance, 250g/2.5N $13.29. 3B Scientific U11025 Helical Spring, 6mm Diameter x 115mm Length, 16 N/m EnergyControl.com is a Belimo Platinum Controls Contractor and Systems Integrator that provides the distribution of Belimo damper actuators and control valves to end users such as as building owners, tenants, and maintenance departments. Get the best deal for Industrial HVAC Damper Actuators from the largest online selection at eBay.com. Browse your favorite brands affordable prices free shipping on many items. Belimo TF120-S Spring Return Fail-Safe On/Off Control . PART NUMBER CHANGED BY THE MANUFACTURER - NEW PART NUMBER #TFB120-S. Application: For On/Off, fail-safe control of dampers in HVAC systems. Actuator sizing should be done in accordance with the damper manufacture's specifications. Control is On/Off from an auxiliary contact, or a manual Control is On/Off from an auxiliary contact, or