Siemens 331-2905 DAMPER ACTUATOR, PNEUMATIC, NUMBER 4, 4" STROKE, 3-7 PSI, INTEGRAL PIVOT MOUNTSiemens 331 2905 Damper Actuator, Pneumatic, Number 4, 4" Stroke, 3 7 psi, Integral Pivot Mount This 331 Number 4 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 7 psi, integral pivot mounting and a replaceable diaphragm. This actuator has an air connection of 1 8" NPT female with a dual barb elbow fitting for 1
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Siemens 331-2905 DAMPER ACTUATOR, PNEUMATIC, NUMBER 4, 4" STROKE, 3-7 PSI, INTEGRAL PIVOT MOUNT