Fire Department, The New York City FDNY 22
Fire Department, The New York City FDNY 22 : Alarm Receiving and Transmittal: (C) "Class 3" Alarms: Less common than the first two means of reporting fires are so-called "Class 3"s which are routed through commercial alarm companies. These firms monitor sprinkler systems, standpipes, smoke detectors and internal pull-stations in non-public occupancies such as factories, warehouses, stores and office buildings. When alarms are received from such accounts, these companies pass-along the information to the F. D. N. Y. central offices, usually by dedicated telephone circuits. (The term "Class 3" derives from the fact that the box number on such an assignment card would have a "3" preceding it as well as a "terminal" following it[e. g. , "3-7012-4" would indicate a private alarm system in a commercial occupancy at a specific address in the immediate vicinity of Box 7012 on the corner of Review Avenue and Laurel Hill Boulevard in Queens]. In such cases, the type of alarm[e. g. , sprinkler, smoke detector, interior pull-station, etc. ] as well as an exact address - and, often, even a specific section of a building - would instantly be made available to responding units)
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