FDAS | Notification Appliances

The alarm sound from audible notification appliances shall b e clearly audible throughout the floor and / or building in which they are installed. It should be sufficient to warn and initiate evacuation of all occupants for whom the alarm sound is intended. A sufficient number of audible notifications appliances shall be used to produce a minimum sound level of 65 dBA, or 10 dB above the ambient noise level having a duration of at least 30 seconds, whichever is greater, measured 1.4 meters above the floor in the area required to be served by the system. The sound level produced by audible notification appliances and the ambient noise combined shall not exceed 115 dBA. If the sound level required is higher than 115 dBA, visual notification appliances such as strobes shall be used in addition to the audible notification appliances generating the maximum allowable sound level. In bars, nightclubs, and other entertainment places where the ambient noise level is high, the...