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The ACA Cyclone is an outdoor warning siren manufactured between 1968 and 2007 by Alerting Communicators of America. It is an omnidirectional, dual-tone siren originally intended for civil defense warning purposes.
The Cyclone was designed in 1968 by Jim Biersach. The first version, the Cyclone 120, used a 40-horsepower motor and produced a sound output of 120 dB at a distance of 100 ft.
|Years||Type||Motor HP||Rotor/Stator interval||Notes|
|1968–1970||Cyclone 120||40 HP||8-12 port||a stator with angled bottom-row ports|
|1970–1980||Cyclone 120||50 HP||8-12 port||stator intake has large air valve beneath; active examples include Toluca, Illinois, and New Richmond, Minnesota|
|1980–2007||Cyclone 125||50 HP||8-12 port||parallel stator enabled an five-fold increased the decibel rating over previous model|