9.33.6.4.(8)

Objective

OH1 Indoor Conditions

Attribution

[F63-OH1.1]Applies to ventilation ducts and their fittings.
[F51,F52-OH1.2]Applies to air duct distribution systems serving heating systems.

Intent

Intent 1:

To limit the probability that duct lining will interfere with the opening or closing of dampers, which could lead to an inability to balance the flow of intake and exhaust air, which could lead to:

  • an inadequate delivery of warm air or return of cold air, or
  • inadequate ventilation.

This is to limit the probability of:

  • the inadequate control of airborne pollutants or relative humidity,
  • an inability to maintain the minimum indoor air temperatures [see Sentence 9.33.3.1.(1)], which could lead to condensation, or
  • inadequate combustion air for fuel-burning appliances.

This is to limit the probability of:

  • the generation of pollutants from biological growth or from materials that become unstable on wetting,
  • the deterioration of building elements, or
  • incomplete combustion.

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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