This unit features a standard 2

Industrial Durability: Built to withstand the thermal cycling and vibration typical of HVACR mechanical rooms

While both are 10

Using it on the suction side depends on local codes and system design

Siemens Building Technology 331-2963 Actuator 318518-761 This unit features a standardThe Siemens 331 2963 is a rugged, No. 4 pneumatic damper actuator designed for reliable control in high demand HVAC and fire smoke systems. Built with a durable metal fabricated body, this piston type actuator features a 4 inch stroke and a nominal spring range of 8 to 13 psi, making it ideal for the gradual or positive actuation of dampers in ventilating systems and mixing boxes. This specific model is configured for a front mount installation using