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6.2.1.3.(1)
OS3OH1
ObjectiveOS3 Safety in Use
Attribution
Application
Application 1: 
Design and installation of mechanical systems and equipment to accommodate relative structural movement, in buildings described in Sentence 1.3.3.2.(1) of Division A.
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], with respect to:
  • mechanical ventilating systems other than self-contained systems serving single dwelling units, as stated in Sentence 9.32.1.2.(2),
  • the ventilation of storage garages for more than 4 motor vehicles in residential occupancies, as stated in Sentence 9.32.1.1.(3),
  • the ventilation of all occupancies other than residential occupancies, as stated in Sentence 9.32.1.1.(2),
  • heating systems, including requirements for combustion air, and air-conditioning systems other than those serving individual dwelling units, as stated in Sentence 9.33.1.1.(2), and
  • air duct distribution systems serving heating systems in which the rated heat input exceeds 120 kW, as stated in Sentence 9.33.6.1.(2).
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Intent
Intent 1: 
To limit the probability that an inadequate design will lead to an inability to accommodate relative structural movement [caused by, for example, expected deflection of structural members, vibration or impact, or earthquake loads], which could lead to toppling of equipment, which could lead to harm to persons.
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