Siemens Building Technology 331-2973 Kit 321894-709 Always verify the orifice size

Always verify the orifice size and gas type of the existing manifold before completing the installation

mercury-free solution

this kit eliminates the need for improvised brackets

1/2-inch hub

Siemens Building Technology 331-2973 Kit 321894-709 Always verify the orifice sizeThe Siemens 331 2973 is a rugged, metal fabricated No. 4 pneumatic damper actuator designed for the gradual or positive control of HVAC systems and fire smoke dampers. Built for high demand applications, this piston type actuator features a 4 inch stroke and a nominal 8 13 psi spring range, ensuring precise positioning of ventilating systems and mixing boxes. This universal kit includes a mounting plate, pivot post, clevis, and damper crank,