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9.33.6.12.(2)
OH1OS2
ObjectiveOS2 Structural Safety
Attribution
Application
Application 1: 
Placement of warm-air supply outlets, in air duct distribution systems serving heating systems in which the rated heat input does not exceed 120 kW and serving only one dwelling unit, in finished rooms located adjacent to exterior walls in dwelling units, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
Exceptions: 
except:
  • for bathrooms, utility rooms or kitchens, where such placement might not be practical, and
  • as stated in Sentence 9.33.6.12.(3), which applies to heating systems that are designed to provide ventilation air.
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Intent
Intent 1: 
To limit the probability of an inadequate distribution of warm air along exterior walls, which could lead to inadequate surface or interstitial temperatures of exterior walls, which could lead to condensation, which could lead to deterioration, which could lead to compromised structural integrity, which could lead to harm to persons.
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