Pneumatic Damper Actuator Operating PSI Range 0 to 25 Max Air Pressure 25 psi Stroke 4 in Nominal Spring Range 8 to 13 psi Mounting Type Pivot Net Force Exerted @ 0 PSI 328 Net Force Exerted @ 18 PSI 1 223 Length 15 3/4 in Width 12 in Height 23 5/8 in Provides Gradual or Positive Actuation of large Dampers For Use With Dampers Includes D-9502-5 Positioner Swivel Mount Bracket Clevis And Crank Arm