9.32.3.1.(2)

Objective

OH1 Indoor Conditions

Attribution

(a),(b)[F40,F50,F52-OH1.1]
(a),(b)[F51,F52-OH1.2]
(c)[F53-OH1.1]

Intent

Intent 1:

[Clauses (a) and (b)] To limit the probability that the performance of heating-season mechanical ventilation systems will fall significantly below expectations.

This is to limit the probability of:

  • inadequate ventilation, or
  • the inadequate control of relative humidity.

This is to limit the probability of the inadequate control of:

  • indoor air temperatures,
  • airborne pollutants,
  • oxygen and other components necessary for breathable air, or
  • condensation, which could lead to the generation of pollutants from biological growth or from materials that become unstable on wetting.

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.

Intent 2:

[Clause (c)] To limit the probability of excessive negative pressure, which could lead to:

  • the ingress of soil gases (such as methane and radon),
  • the spillage of combustion products from fuel-burning appliances that are susceptible to spillage, or
  • moisture ingress from the ground.

This is to limit the probability of negative effects on the air quality of indoor spaces, which could lead to harm to persons.

Intent 3:

To direct Code users to Articles 9.32.3.3., 9.32.3.7. and 9.32.3.8., for requirements regarding required components of heating-season mechanical ventilation systems in dwelling units with 5 or fewer bedrooms.

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