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6.2.5.2.(1)
OP1OH1OS1
ObjectiveOH1 Indoor Conditions
Attribution
Application
Application 1: 
Design of fuel-fired appliances installed outside of 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 heating systems, including requirements for combustion air, and air-conditioning systems other than those serving individual dwelling units, as stated in Sentence 9.33.1.1.(2).
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Intent
Intent 1: 
To limit the probability that the installation of fuel-fired appliances that are not designed for the application will lead to:
  • performance that is significantly below expectations, which could lead to:
    • an inadequate delivery of warm air, which could lead to an inability to maintain adequate indoor air temperatures, or
    • inadequate ventilation, which could lead to the inadequate control of:
      • airborne pollutants, or
      • relative humidity, which could lead to condensation, which could lead to the growth of mould and mildew, or
  • blockage of vents by ice or snow, which could lead to an inability to vent combustion products, which could lead to the entry of combustion products into occupied space.
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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