24/120 VAC 20 to 29 VDC Photoelectric Low-Flow Duct Smoke Detector - 4-Wire, 100 to 4000 Ft / Min Velocity, 15 Sec Alarm Response Time

24/120 VAC 20 to 29 VDC Photoelectric Low-Flow Duct Smoke Detector - 4-Wire, 100 to 4000 Ft / Min Velocity, 15 Sec Alarm Response Time

System Sensor

MFR# D4120 | MSC-76579