Siemens 331-2974

Damper Actuator, Pneu No 4, 2-⅜” Stroke, Unit Ventilator Hesitation Model

This 331 Number 4 Pneumatic Damper Actuator has a 2 ⅜” stroke for unit ventilators and is a rugged, metal-fabricated device that provides gradual or positive actuation of HVAC and fire/smoke dampers. This hesitation model actuator has a nominal spring range of 2 to 3 and 8 to 13 psi, is fixed bracket mounted and provides minimum ventilation without separate damper/actuator. This actuator has an air connection of ⅛” NPT female with a dual barb elbow fitting for ¼” OD tubing.

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