Siemens 331-2904 DAMPER ACTUATOR, PNEU NO 4, 4" STROKE, 3-7PSI, INTEGRAL PIVOT MOUNT, UL REC F/SSiemens 331 2904 Damper Actuator, Pneu No 4, 4" Stroke, 3 7psi, Integral Pivot Mount, UL Rec F S This 331 Number 4 Pneumatic Damper Actuator is UL recognized for fire and smoke applications and 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
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Siemens 331-2904 DAMPER ACTUATOR, PNEU NO 4, 4" STROKE, 3-7PSI, INTEGRAL PIVOT MOUNT, UL REC F/S