Pneumatic Unit Ventilator Damper Actuator, 3-12 PSI Spring Range, Spring Return, 1/8" NPT Air Connections, 2 1/8"-2 1/2" Stroke, 11 Square Inch Diaphragm, -20-160 Temperature Range, 5-95% RH Humidity Range, Lever Arm Moves to the Desired Minimum Position as Air Pressure Increases from 0-3 PSI, Hesitates from 3-8 PSI, and Completes its Stroke from 8-12 PSI

Pneumatic Unit Ventilator Damper Actuator, 4-8 PSI Spring Range, Spring Return, 1/8" NPT Air Connections, 2 1/8"-2 1/2" Stroke, 11 Square Inch Diaphragm, -20-160 Temperature Range, 5-95% RH Humidity Range

Pneumatic Unit Ventilator Damper Actuator, 5-12 PSI Spring Range, Spring Return, 1/8" NPT Air Connections, 2 1/8"-2 1/2" Stroke, 11 Square Inch Diaphragm, -20-160 Temperature Range, 5-95% RH Humidity Range