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9.33.6.6.(3)
ApplicationIntent
OH1OS1OS2OP1
ObjectiveOH1 Indoor Conditions
Attribution
[F43,F63-OH1.1] [F51,F52-OH1.2]
Application
Application 1: 
Fitting of joints for round ducts, 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 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 excessive air leakage, which could lead to:
  • an inability to maintain the minimum indoor air temperatures [see Sentence 9.33.3.1.(1)], which could lead to condensation,
  • inadequate ventilation, or
  • inadequate combustion air for fuel-burning appliances, which could lead to incomplete combustion.
This is to limit the probability of:
  • the inadequate control of airborne pollutants or relative humidity,
  • the generation of pollutants from biological growth or from materials that become unstable on wetting,
  • the deterioration of buiding elements, or
  • the entry of combustion products into living space.
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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