Optical beam smoke detectors are particularly suitable for guarding properties with massive open Areas like warehouses, atriums etcetera. Optical beam smoke detectors are uniquely suited to safeguarding structures with massive open up regions with substantial ceilings like a warehouse or atrium. The OSI-R-SS detector can be a blended transmitter/receiver unit https://www.firesense.co.uk/type/conventional-fire-system/conventional-beam-detectors/