For technicians managing service calls

improving system efficiency

providing a reliable interface for modern HVACR control systems

including the FS7-4L

System Sensor D2 Smoke Detector 30067439-890 For technicians managing service callsFor contractors and fire safety professionals, the System Sensor D2 remains a standard for reliable detection within air handling systems. This 2 Wire InnovairFlex Photoelectric Low Flow Duct Smoke Detector is engineered to operate across a broad air duct velocity range of 100 to 4,000 feet per minute, making it suitable for both high speed supply ducts and low velocity return air applications. Built on a modular platform, the InnovairFlex D2 features