This 20" x 8" unit features a robust 24Vac power open/power closed actuator

the unit supports multi-positional mounting (excluding upside down) and utilizes a right-hand outlet configuration for streamlined manifold connection

Technicians should reference the flash codes provided in the unit’s service manual to identify issues with the pressure switch

The wires are protected by high-temperature fiberglass insulation rated for 200°C

Whether you are addressing decreased CFM or high-decibel mechanical noise

Siemens Building Technology 331-2998 Actuator 320720-756 This 20" x 8" unitThe Siemens Building Technology 331 2998 is a high performance No. 4 Pneumatic Damper Actuator engineered for the gradual or positive actuation of HVAC dampers. This rugged, metal fabricated unit is a staple for contractors managing air flow in fire and smoke damper systems, mixing boxes, and terminal units. With a 4 inch stroke and a nominal spring range of 8 13 psi, this actuator provides the precise mechanical force required for reliable pneumatic