Optical beam smoke detectors are notably appropriate for safeguarding buildings with significant open Areas including warehouses, atriums etc. Optical beam smoke detectors are uniquely suited to protecting properties with substantial open up places with higher ceilings such as a warehouse or atrium. The OSI-R-SS detector is usually a merged transmitter/receiver https://www.firesense.co.uk/type/conventional-fire-system/conventional-beam-detectors/