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9.33.6.9.(1)
OS2OH1
ObjectiveOS2 Structural Safety
Attribution
Application
Application 1: 
Warm-air supply systems serving heating systems in which the rated heat input does not exceed 120 kW and serving only one dwelling unit, in residential buildings built on concrete slabs-on-ground to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
Application 2: 
This also applies to ventilation ducts and their fittings, as stated in Sentence 9.32.3.11.(1).
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Intent
Intent 1: 
To limit the probability of an inadequate distribution of heat to slab edges, which could lead to inadequate warming of the perimeter of slabs-on-ground, which could lead to the freezing of soil beneath slab edges, which could lead to:
  • the formation of ice lenses, which could lead to soil movement, which could lead to structural damage to the slab and building superstructure, or
  • the condensation of water vapour on the slab surface, which could lead to the rotting or corrosion of structural building elements.
This is to limit the probability of harm to persons.
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