Warning This information has been archived because it is outdated and no longer relevant.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

9.32.3.6.(1)
ApplicationIntent
OH1OS3
ObjectiveOH1 Indoor Conditions
Attribution
[F40,F50,F52-OH1.1]
Application
Application 1: 
Dwelling units that:
  • do not contain any:
  • do contain either:
    • a forced air distribution system with a circulation fan with a rated capacity at least 5 times the actual normal operating capacity of the fan serving as the principal ventilation fan, where the circulation fan has a supply side that complies with Sentences 9.32.3.5.(10) to 9.32.3.5.(12), and a return side that complies with Articles 9.33.6.13. and 9.33.6.14., or
    • a system of exhaust ducts fitted with balancing dampers complying with Sentence 9.32.3.5.(12) and designed such that the principal ventilation fan draws all of its air from each bedroom, the principal living area, and any storey without a bedroom as described in Sentence 9.32.3.5.(10).
This applies to 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.
Top of Page
Intent
Intent 1: 
To limit the probability of the inadequate replacement of indoor air with outdoor air.
This is to limit the probability of the inadequate control of :
  • airborne pollutants,
  • oxygen and other components necessary for breathable air, or
  • relative humidity, which could lead to condensation, which could lead to the generation of pollutants from biological growth or from materials that become unstable on wetting.
This is to limit the probability of negative effects on the air quality of indoor spaces, which could lead to harm to persons.
Intent 2: 
[Subclause (b)(i)] To expand the application of Articles 9.33.6.13. and 9.33.6.14. to exhaust-only ventilation systems.
Top of Page