An air-sampling smoke detector is capable of detecting microscopic particles of smoke [5]. Air samples are drawn through a network of small-bore pipes and past a sensitive optical device, often a solid-state laser, tuned to detect the extremely small particles of combustion. Most air-sampling smoke detection systems are capable of a higher sensitivity than spot type smoke detectors. This provides earlier notification of a developing fire allowing manual intervention or activation of automatic suppression systems before a fire has developed beyond the smoldering stage, thereby increasing the time available for evacuation and minimizing fire damage.