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Smith BTR unit
making it compatible with a wide range of single-phase residential and commercial systems
standardized connection to the wiring system
this wheel is engineered to provide quiet
Siemens Building Technology 331-2929 Actuator 322057-301 Smith BTR unitThe Siemens 331 2929 Actuator is a heavy duty No. 4 pneumatic damper actuator designed for professional HVACR installations requiring high torque performance. Featuring a 3 7 psi spring range and a standard 4 inch stroke, this unit is engineered for the gradual or positive actuation of large dampers, mixing boxes, and terminal unit air valves. Built with a rugged, all metal body and a replaceable EPDM rolling diaphragm, this pneumatic damper actuator
