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System Sensor Duct Smoke Detector: 120V AC/24V AC/DC Volt, Sound Alert, Duct Mount, 5 in Overall Ht Model: D4120

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System Sensor Duct Smoke Detector: 20V AC/24V AC/24V DC Volt, 100 Ma Current, Duct Mount, White Model: D4120W

System Sensor D4120 4-Wire Duct Smoke Detector, 4-Wire, Photoelectric, Low-Flow (24/120V), D4120 | Supplyhouse.Com

System Sensor 5601P Heat Detector, 135F Fixed Temp/Rate-Of-Rise, Single-Circuit, Plain Housing

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SYSTEM SENSOR, D4120W, NA, NA, Watertight Photoelectric Duct Smoke Detector, 24VDC/120VAC 4-Wire

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System Sensor | D4120 | Smoke Detector 4-Wire Photoelectric Duct | Gas And Specialty Sensors - Smoke Detection

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