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9.33.6.14.(5)
ApplicationIntent
OH1OS2
ObjectiveOH1 Indoor Conditions
Attribution
[F51,F52-OH1.1,OH1.2]
Application
Application 1: 
Isolation of spaces between studs or joists used as return ducts in air duct distribution systems, for heating systems in which the rated heat input does not exceed 120 kW, 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].
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Intent
Intent 1: 
To limit the probability of a drop in pressure and a reduction in the flow of return air from rooms, which could lead to:
  • an inability to maintain the minimum indoor air temperatures [see Sentence 9.33.3.1.(1)], or
  • where required ventilation is provided by the forced-air heating system, inadequate ventilation.
This is to limit the probability of:
  • the inadequate control of airborne pollutants or relative humidity, or
  • condensation, which could lead to:
    • the generation of pollutants from biological growth or from materials that become unstable on wetting,
    • the deterioration of building elements, or
    • compromised performance of environmental separators,
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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