9.32.3.3.(4)

Objective

OH1 Indoor Conditions

Attribution

Intent

Intent 1:

To limit the probability that equipment will fail prematurely, which could lead to an inability to regulate the airflow in ventilation systems, which could lead to:

  • where both exhaust and supply fans are affected, inadequate ventilation,
  • where exhaust fans alone are affected, excessive positive pressure, or
  • where supply fans alone are affected, excessive negative pressure.

This is to limit the probability of:

  • the inadequate control of airborne pollutants, or oxygen and other components necessary for breathable air,
  • the inadequate control of relative humidity, which could lead to condensation on interior surfaces,
  • 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, or
  • excessive positive pressure, which could lead to condensation within assemblies.

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

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