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3.4.4.4.(8)
ApplicationIntent
OS1OP1
ObjectiveOS1 Fire Safety
Attribution
[F05-OS1.5] [F06-OS1.5,OS1.2]
Application
Application 1: 
Storage rooms, washrooms, toilet rooms, laundry rooms and similar ancillary rooms opening directly into exits.
This applies to exits serving floor areas that are intended for occupancy, including mezzanines as stated in Sentence 3.4.2.2.(1), in buildings described in Sentence 1.3.3.2.(1) of Division A.
Application 2: 
This also applies to tents and air-supported structures, as stated in Sentences 3.1.6.1.(1) and 9.10.1.2.(1).
Exceptions: 
except as stated in:
  • Sentence 3.1.6.2.(1), which prohibits air-supported structures from being located above the first storey on any building,
  • Sentence 3.1.6.2.(2), which prohibits air-supported structures from being used for classrooms or for Groups B, C, or Group F, Division 1 major occupancies,
  • Sentence 3.1.6.2.(3), which requires air-supported structures to be designed as open floor spaces without interior walls, mezzanines, intermediate floors or similar construction,
  • Sentence 3.3.1.3.(5), which applies to rooftop enclosures,
  • Sentence 3.4.2.2.(2), which applies to mezzanines that:
    • are not required to terminate at a vertical fire separation [see Article 3.2.8.1.],
    • are not intended for an occupant load more than 60,
    • do not exceed the area limits for rooms and suites in Table 3.4.2.2., and
    • have limited travel distances to egress doors or stairs, and
  • Sentence 3.4.2.2.(3), which applies to at least half of the required means of egress from a mezzanine if the mezzanine is not required to terminate at a fire separation as permitted by Sentence 3.2.8.2.(1).
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Intent
Intent 1: 
To limit the probability that a fire involving certain rooms will spread to the exit, which could lead to delays in the evacuation or movement of persons to a safe place, which could lead to harm to persons.
Intent 2: 
To limit the probability that a fire involving certain rooms will spread to the exit, which could lead to emergency responders being delayed in gaining access to floor areas, which could lead to delays or ineffectiveness in fire emergency response operations, which could lead to delays in the evacuation or movement of persons to a safe place, which could lead to harm to persons, including emergency responders.
Intent 3: 
To limit the probability that venting of equipment in washrooms, toilet rooms and laundry rooms will lead to a negative pressure in the exit and draw in products of combustion from other spaces, which could lead to delays in the evacuation or movement of persons to a safe place, which could lead to harm to persons.
Intent 4: 
To limit the probability that venting of equipment in washrooms, toilet rooms and laundry rooms will lead to a negative pressure in the exit and draw in products of combustion from other spaces, which could lead to emergency responders being delayed in gaining access to exits, which could lead to delays or ineffectiveness in fire emergency response operations, which could lead to:
  • delays in the evacuation or movement of persons to a safe place, which could lead to harm to persons, including emergency responders, and
  • the spread of fire to other parts of the building, which could lead to harm to persons.
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