check the actual differential pressure at the switch ports during the inducer pre-purge

removing the need for a bellows or seal that could leak

including parts D344714P01 and CNT07942

which eliminates the need for field modifications and ensures peak airflow efficiency

Siemens Building Technology GRD226.1U Actuator 320788-702 check the actual differential pressureThe Siemens OpenAir GRD226. 1U is a heavy duty fire and smoke damper actuator engineered for life safety systems requiring high reliability fail safe performance. Operating at 120V AC, this spring return actuator provides 30 lb in of torque, making it a standard choice for two position control of small to medium combination fire and smoke dampers. Designed to meet stringent UL555 and UL555S safety standards, the GRD226. 1U features a 30 second drive