D4120

Honeywell System Sensor D4120 is a 4-wire photoelectric duct smoke detector designed to detect smoke in HVAC systems. Part of the InnovairFlex series, it operates at 24 VAC/DC or 120 VAC, features a pivoting housing for rectangular/round ductwork, and operates efficiently in airflow speeds of 100 to 4,000 feet per minute (ft/min). It is used to shut down air handling systems upon detecting smoke to prevent its spread throughout a building. It is used in combination with Probe DST1.5 Ordering code D4120 + DST1.5