Warning This information has been archived because it is outdated and no longer relevant.

Archived Content

Information identified as archived on the Web is for reference, research or recordkeeping purposes. It has not been altered or updated after the date of archiving. Web pages that are archived on the Web are not subject to the Government of Canada Web Standards. As per the Communications Policy of the Government of Canada, you can request alternate formats on the "Contact Us" page.

9.33.6.14.(6)
OH1OS2
ObjectiveOH1 Indoor Conditions
Attribution
Application
Application 1: 
Maximum number of openings in vertical return ducts, in air duct distribution systems serving heating systems in which the rated heat input does not exceed 120 kW and serving only one dwelling unit, in buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9].
Top of Page
Intent
Intent 1: 
To limit the probability of connecting return ducts to rooms on multiple floor levels with different stack pressures, which could lead to an inadequate flow of return air from upper-level rooms, which could lead to an inability to regulate the flow of warm air to rooms, which could lead to:
  • an inability to maintain the minimum indoor air temperatures [see Sentence 9.33.3.1.(1)], or
  • inadequate ventilation.
This is to limit the probability of:
  • the inadequate control of airborne pollutants or relative humidity, or
  • condensation.
This is to limit the probability of:
  • the generation of pollutants from biological growth or from materials that become unstable on wetting, or
  • the deterioration of building elements.
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.
Top of Page