Optical beam smoke detectors are significantly appropriate for defending structures with large open spaces including warehouses, atriums etc. Optical beam smoke detectors are uniquely suited to safeguarding properties with large open up parts with substantial ceilings such as a warehouse or atrium. The OSI-R-SS detector is a merged transmitter/receiver unit https://sb-bookmarking.com/story18617670/conventional-beam-detectors-an-overview