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3.2.4.19.(1)
OS1
ObjectiveOS1 Fire Safety
Attribution
Application
Application 1: 
Visibility of visual signal devices [forming part of a fire alarm system] required by Sentences 3.2.4.17.(4) and 3.2.4.18.(7) and (8):
  • in buildings or portions of buildings intended for use primarily by persons with hearing impairment,
  • where:
    • the ambient noise level is more than 87 dBA, or
    • the occupants of the floor area use ear protective devices, are located within an audiometric booth or are located within sound insulating enclosures, and
  • in assembly occupancies in which music and other sounds associated with performances could exceed 100 dBA.
This applies to buildings described in Sentence 1.3.3.2.(1) of Division A in which fire alarm systems are installed.
Application 2: 
This also applies to buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9] in which fire alarm systems are installed, as stated in Sentence 9.10.18.6.(1).
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Intent
Intent 1: 
To limit the probability that persons relying on visual information to warn them of an emergency situation will not be promptly notified of a fire situation, which could lead to delays in evacuation or moving to a safe place, which could lead to harm to persons.
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