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9.33.6.12.(2)
ApplicationIntent
OH1OS2
ObjectiveOH1 Indoor Conditions
Attribution
[F63-OH1.1] [F51-OH1.2]
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 inadequate surface or interstitial temperatures of exterior walls.
This is to limit the probability of condensation, which could lead to:
  • the inadequate control of relative humidity,
  • the generation of pollutants from biological growth or from materials that become unstable on wetting, or
  • compromised integrity of environmental separators or elements protected by such separators, which could lead to deterioration.
This is to limit the probability of:
  • negative effects on the air quality of indoor spaces, or
  • the inadequate thermal comfort of persons.
This is to limit the probability of harm to persons.
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