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000 text logs with enterprise-grade performance
Durable all-metal construction for long-lasting use
high-performance video recording and playback
garage doors
System Sensor D4120 Marks USA 000 text logs with enterprise-gradeSystem Sensor D4120 4 Wire 24VDC 120VAC Photoelectric Low Flow Duct Smoke Detector System Sensor D4120 4 Wire Photoelectric Low Flow Duct Smoke Detector provides reliable smoke detection in HVAC duct applications with wide operating ranges and advanced false alarm immunity. Its pivoting housing and plug in sensor design simplify installation, testing, and maintenance across square, rectangular, and round duct systems. 4 wire photoelectric duct smoke