Audible Alarms [4.28.2]
Sound levels are specified in this section to benefit people who have a hearing impairment. The sound of the alarm must be able to be distinguished above and apart from the prevailing sound level within the space. Recommendation: Alarms with a periodic element to the signal, such as single stroke bells, hi-low, and fast whoop, are considered more effective than those with continuous or reverberating tones. Consider a signal with a sound characterized by three or four pure tones without much "noise" in between.
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