Notifier FSV-951R Very Intelligent Early Warning (VIEW) Detector (White)The Notifier FSV 951R (VIEW) is an intelligent high sensitivity photoelectric smoke detector for very early warning fire detection on Notifier SLC loops using FlashScan protocol. It uses a refined smoke sensing chamber and patented optic block to amplify real smoke signals while reducing internal reflections that can cause false alarms. FSV 951R (VIEW) is UL listed for open area and duct applications in DNR DNRW housings, uses rotary decimal switches