Siemens 331-2929 DAMPER ACTUATOR, PNEU NO 4, 4" STROKE, 3-7PSI, INTEGRAL PIVOT MOUNT, CLEVISSiemens 331 2929 Damper Actuator, Pneu No 4, 4" Stroke, 3 7psi, Integral Pivot Mount, Clevis This 331 Number 4 Pneumatic Damper Actuator has a clevis and clevis pin for use with frame mounting accessory 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
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Siemens 331-2929 DAMPER ACTUATOR, PNEU NO 4, 4" STROKE, 3-7PSI, INTEGRAL PIVOT MOUNT, CLEVIS