Siemens Building Technology 331-2904 Actuator L99H008 The double union design simplifies

The double union design simplifies service and replacement

or bearing wear resulting in increased amp draw and thermal tripping

ensuring standard mounting and electrical cross-compatibility

Its normally open contacts offer a reliable switching solution for multi-stage heating applications

Siemens Building Technology 331-2904 Actuator L99H008 The double union design simplifiesThe Siemens 331 2904 is a heavy duty #4 pneumatic damper actuator designed for the gradual or positive actuation of large dampers in commercial ventilating systems. This piston type actuator features an all metal body construction and is specifically UL recognized for high stakes fire and smoke applications. With a 3 7 psi spring range and a generous 4 inch stroke, it provides the necessary force for reliable operation of outdoor air, return air, and