System Sensor D4120 4-Wire Smoke Detector, Duct Mount, Model D4120

System Sensor LD4S Duct Smoke Detector

System Sensor D4120 Photoelectric Duct Smoke Detector Used UNTESTED Sold AS IS

System Sensor D4120 4 Wire Photoelectric Duct Smoke Detector

System Sensor DH400ACDCPX Smoke Duct Detector (KB)

System Sensor YD4120 For Smoke Detector Duct Application. Used W/o Clear Shield

SYSTEM SENSOR 2-Wire D2 Photoelectric Duct Smoke Detector

System Sensor DNR Intelligent Non-Relay Duct Smoke Detector Remote Test Capable