Siemens 331-2857 DAMPER ACTUATOR, PNEUMATIC NUMBER 6, 4" STROKE, 3-8 PSI, PIVOT MOUNT, CLEVISSiemens 331 2857 Damper Actuator, Pneumatic Number 6, 4" Stroke, 3 8 psi, Pivot Mount, Clevis This 331 Number 6 Pneumatic Damper Actuator is a rugged, metal fabricated device that provides gradual or positive actuation of HVAC and fire smoke dampers. This actuator has a nominal spring range of 3 to 8 psi, is pivot mounted and has a replaceable diaphragm. This actuator has a 1 8" NPT female air connection. Additional Information Pneumatic ModelNo. 6
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