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9.32.3.5.(7)
OH1
ObjectiveOH1 Indoor Conditions
Attribution
Application
Application 1: 
Airflow measurements in outdoor air supply ducts in self-contained heating-season mechanical ventilation systems that are not coupled to forced air heating 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 the required airflow measurements will not be within acceptable limits, which could lead to excessive negative or positive pressure within the dwelling unit, which could lead to harm to persons.
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