Fire Alarm Notification Appliance - Methods of Notification

Methods of Notification

The primary function of the notification appliance is to alert persons at risk. Several methods are used and documented in industry specifications published by UL.

Alerting methods include:

  • Sound (audible signals)
    • usually around 3200 Hz due to component constraints
    • 45dB to 120dB A weighted for human hearing
  • Light (visible signals)
    • 15 cd to 1000 cd candela output
    • 1 to 2 flashes per second

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