the majority of audible notification appliances installed prior to 1996 produced a steady sound for evacuation. in 1996, the ansi and the nfpa recommended a standard evacuation pattern to eliminate confusion. audible notification appliances would now have to include strobe lights with higher brightness intensity to alert the hearing impaired.
in the 1990s, voice evacuation started to become the standard for large facilities, and is still growing in popularity. from 2005 to 2007, research sponsored by the nfpa focused on understanding the cause of a higher number of deaths seen in high-risk groups such as the elderly, those with hearing loss, and those who are intoxicated.  effective january 1, 2014, section 184.108.40.206 of the 2010 and later editions of nfpa 72 requires the low frequency audible fire alarm signal in occupancy sleeping areas with a protected premises (building) fire alarm system.
the objective of this blog series is to discuss some of the major components and functions of a fire alarm system. when a fire alarm system is installed within a building, the requirements for the type of notification (audible, visible, and voice) is driven by the building code, fire code, or life safety code that is adopted in that jurisdiction. the audible notification can consist of either tones and a voice message, or just tones.
for example, a fire alarm system within a restaurant would utilize public mode signaling to alert all the occupants that there is an emergency and that they need to evacuate. in the case of sleeping areas, the sound is required to have a low frequency 520 hz (typical fire alarm notification frequencies are in the 3150 hz range) as studies have shown that this low frequency is more effective at waking occupants. the most common type of visual signals provided to occupants from a fire alarm system is the use of strobes. i will be updating this series over the next few months to add a deeper dive into different portions of the fire alarm 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. a fire alarm notification appliance is an active fire protection component of a fire alarm system. a notification appliance may use audible, visible, notification appliances are controlled by the fire alarm control unit (facu) using a notification appliance circuit (nac). each notification “the most common notification appliances are horns, strobes and horn-strobes, as well as speakers and speaker-strobes,” says chris hill, global, where are fire alarm notification devices required, types of fire alarm notification devices, tactile notification appliance examples, tactile notification appliance examples, notification appliance circuit.
the most frequently asked question is: “when a fire alarm system operates to signal an ‘alarm,’ should the visible notification appliances (strobes) remain addressable and conventional notification appliances and speakers help alert a range of appliances for fire alarm and emergency communications system what are different types of fire alarm notification devices? audible and visual alarms when the fire system detects a possible fire., strobe lights are an example of which notification appliance category, fire alarm notification sound.
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