331-2906 | Damper Actuator, Pneu No 4, 4" Stroke, 5-10psi, Integral Pivot Mt, UL Rec F/S | Siemens

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 5 to 10 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 1/4" OD tubing.