Optical beam smoke detectors are notably appropriate for guarding structures with big open Areas for instance warehouses, atriums etc. Optical beam smoke detectors are uniquely suited to protecting properties with substantial open regions with superior ceilings for instance a warehouse or atrium. The OSI-R-SS detector is a blended transmitter/receiver unit https://www.firesense.co.uk/type/conventional-fire-system/conventional-beam-detectors/