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9.32.3.13.(10)
OH1OS3
ObjectiveOH1 Indoor Conditions
Attribution
Application
Application 1: 
Screens, grilles and filters installed on air intake and exhaust openings, in self-contained heating-season mechanical ventilation systems serving single dwelling units with 5 or fewer bedrooms that are supplied with electrical power and a heating system, in buildings to which:
  • Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9], or
  • Part 6 applies [see Sentence 1.3.3.2.(1) of Division A for application of Part 6 and Sentence 6.2.2.1.(3)].
Exceptions: 
except as stated in Sentence 9.32.3.1.(1), which applies to heating-season mechanical ventilation systems designed to comply with CAN/CSA-F326-M.
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Intent
Intent 1: 
To limit the probability that screens or grilles on air intake or exhaust openings will become blocked due to lack of maintenance, which could lead to:
  • where both exhaust and supply fans are restricted, inadequate ventilation,
  • where exhaust fans alone are restricted, excessive positive pressure, or
  • where supply fans alone are restricted, 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,
  • condensation within assemblies,
  • moisture ingress from the ground,
  • the ingress of soil gases (such as methane and radon), or
  • the spillage of combustion products from fuel-burning appliances that are susceptible to spillage.
This is to limit the probability of:
  • the generation of pollutants from biological growth or from materials that become unstable on wetting, or
  • pollutant ingress (including combustion products and soil gases).
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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