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6.2.3.8.(11)
ApplicationIntent
OH1OH1
ObjectiveOH1 Indoor Conditions
Attribution
[F81-OH1.2]
Application
Application 1: 
Preventing condensation in exhaust ducts, in ventilating systems, containing air from heated spaces that pass through or are adjacent to unheated spaces, in buildings described in Sentence 1.3.3.2.(1) of Division A.
Application 2: 
This also applies to buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], with respect to:
  • mechanical ventilating systems other than self-contained systems serving single dwelling units, as stated in Sentence 9.32.1.2.(2), and
  • the ventilation of all occupancies other than residential occupancies, as stated in Sentence 9.32.1.1.(2).
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Intent
Intent 1: 
To limit the probability that exhaust ducts will have inadequate thermal resistance, which could lead to the excessive cooling of exhaust ducts, which could lead to:
  • the accumulation of condensation in exhaust ducts when temperatures are above the freezing point, or
  • the freezing of accumulated condensation in exhaust ducts when temperatures are below the freezing point, which could lead to the buildup of ice in the ducts, which could lead to ducts being blocked, which could lead to inadequate ventilation.
This is to limit the probability of the inadequate control of relative humidity or indoor air temperatures, which could lead to the inadequate thermal comfort of persons, which could lead to harm to persons.
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