Fire detection, monitoring and alarm systems and accompanying accessories, including network systems, multiplex systems, stand alone systems, emergency warning and intercommunication systems and fire alarm emergency phone systems, comprising, graphical command centres, manual stations, smoke detectors and sensors, flame detectors, heat detectors and sensors, door holders and/or closures, modems, fibre optic line drivers, audible and visible notification appliances, annunciators, CRT monitors and printers, batteries and chargers and transient suppressors and air aspiration smoke detection systems and accessories