A fire alarm system is number of devices working together to detect and warn people through visual and audio appliances when smoke, fire,carbon monoxide or other emergencies are present. These alarms may be activated from smoke detectors, and heat detectors. Alarms can be either motorized bells or wall mountable sounders or horns.
They can also be speaker strobes which sound an alarm, followed by a voice evacuation message which warn people inside the building not to use the elevators. They may also be activated via Manual fire alarm activation devices such as manual call points or pull stations.
Fire alarm sounders can be set to certain frequencies and different tones including low, medium and high depending on the country and manufacturer of the device. Most fire alarm systems in Europe sound like a siren with alternating frequencies. Fire alarm sounders in the United States can be either continuous or set to different codes such as Code 3. Fire alarm warning devices can also be set to different volume levels. Smaller buildings may have the alarm set to a lower volume and larger buildings may have alarms set to a higher level.
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