This part number refers specifically to the venter wheel and disc

High-Load Capacity: Direct control of inductive loads up to 16 FLA and non-inductive loads up to 20A reduces the footprint of the control panel

For rapid field installation

and WeatherKing gas furnaces to ensure proper voltage draw and heat output

spring-return zone actuator engineered for reliable performance in critical HVAC hydronic applications

Siemens Building Technology 331-4811 Actuator 320720-756 This part number refers specificallyFor veteran technicians managing air handler units and mixing boxes, the Siemens 331 4811 represents the industry standard for pneumatic reliability. This No. 3 Pneumatic Damper Actuator is engineered with a rugged, all metal body designed to withstand the harsh environments of mechanical rooms. Operating on a nominal 8 to 13 psi spring range, this unit provides precise, gradual, or positive actuation of HVAC dampers and air valves. The 331 4811