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  2. Siren (alarm) - Wikipedia

    en.wikipedia.org/wiki/Siren_(alarm)

    Most fire sirens are either mounted on the roof of a fire station or on a pole next to the fire station. Fire sirens can also be mounted on or near government buildings, on tall structures such as water towers, as well as in systems where several sirens are distributed around a town for better sound coverage. Most fire sirens are single tone ...

  3. Fire alarm system - Wikipedia

    en.wikipedia.org/wiki/Fire_alarm_system

    Fire alarm sounders can be set to certain frequencies and different tones, either low, medium, or high, depending on the country and manufacturer of the device. Most fire alarm systems in Europe sound like a siren with alternating frequencies.

  4. Fire alarm notification appliance - Wikipedia

    en.wikipedia.org/wiki/Fire_alarm_notification...

    European Siren for fire detection system. A fire alarm notification appliance is an active fire protection component of a fire alarm system.A notification appliance may use audible, visible, or other stimuli to alert the occupants of a fire or other emergency condition requiring action.

  5. Civil defense siren - Wikipedia

    en.wikipedia.org/wiki/Civil_defense_siren

    A Grifco 777 Siren at Empire Bay Rural Fire Station A Grifco 888 Siren at Penrith Fire Station, New South Wales, Australia. A series of 98 electronic sirens, making up a large-scale public-address system (the "Sydney CBD Emergency Warning System") and including 13 variable-message signs, are installed in the Sydney central business district.

  6. Hawaii has a robust emergency siren warning system. It sat ...

    www.aol.com/hawaii-robust-emergency-siren...

    In fact, the state’s vaunted integrated outdoor siren warning system – the largest in the world, with about 400 alarms – was not activated during the fires, according to Hawaii Emergency ...

  7. Manual fire alarm activation - Wikipedia

    en.wikipedia.org/wiki/Manual_fire_alarm_activation

    Many modern fire alarm pull stations are single-action and only require the user to pull down a handle to sound the alarm. Other fire alarm pull stations are dual-action, and as such require the user to perform a second task before pulling down, such as lifting or pushing in a panel on the station or breaking a glass panel with an attached hammer.