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9.33.6.12.(3)
ApplicationIntent
OH1
ObjectiveOH1 Indoor Conditions
Attribution
[F40,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 that are designed to provide ventilation air and that serve only one dwelling unit, in buildings 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 ineffective mixing of ventilation air with room air, which could lead to stratification near the floor due to the potentially cooler temperature and higher density of ventilation air, which could lead to:
  • an inability to maintain the minimum indoor air temperatures [see Sentence 9.33.3.1.(1)], or
  • inadequate ventilation.
This is to limit the probability of:
  • the inadequate control of airborne pollutants or relative humidity, or
  • condensation.
This is to limit the probability of:
  • the generation of pollutants from biological growth or from materials that become unstable on wetting, or
  • the deterioration of building elements.
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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