Honeywell MP909D 1441 2 9101 Pneumatic Damper Actuator

The Honeywell MP909D 1441 2 9101 Pneumatic Damper Actuator is a 5–10 psi-controlled device that positions HVAC dampers using compressed air. It translates a low-pressure pneumatic signal into precise damper movement, enabling reliable airflow modulation in air-handling units and other ductwork associated with commercial building automation. The MP909D designation identifies this actuator within Honeywell’s damper actuator family, with the numerals 1441, 2, and 9101 serving as model and compatibility codes used in control schemes. Because it operates on pneumatic control air, this device is designed for systems that rely on compressed air rather than electrical signals to drive damper position, simplifying integration in environments where pneumatic control is specified. Typical applications include regulating damper openings to control supply and return air flows, supporting consistent ventilation and zone temperature management in commercial spaces.