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Damper Actuator, Pneu No 4, 3″ Stroke, Unit Ventilator, 3-7psi
This 331 Number 4 Pneumatic Damper Actuator has a 3″ stroke for unit ventilator 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, a non-pivot mounting bracket and a replaceable diaphragm. This actuator has an air connection of 1/8″ NPT female with a dual barb elbow fitting for 1/4″ OD tubing.