Warning This information has been archived because it is outdated and no longer relevant.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

2.5.6.3.(1)
ApplicationIntent
OH1
ObjectiveOH1 Indoor Conditions
Attribution
[F81-OH1.1]
Application
Application 1: 
Location of vent pipes that protect fixture traps, in drainage systems for buildings.
Exceptions: 
except as stated in:
  • Sentence 2.5.6.3.(2), which applies to trap arms of water closets, S-trap standards or fixtures that depend on siphonic action for the proper functioning of a fixture that discharges vertically, and
  • Sentence 2.5.6.3.(3), which applies to vent pipes that protect water closets or fixtures that depend on siphonic action for proper functioning.
Top of Page
Intent
Intent 1: 
To limit the probability that an inappropriate location for the fixture traps will lead to:
  • an inadequate trap arm length, which could lead to blockage of vents by solids leaving traps,
  • an excessive trap arm fall, which could lead to excessive siphonic action on traps,
  • an excessive trap arm direction change, which could lead to flow obstructions between traps and vent connections, and
  • the evaporation of trap seals due to air movement in DWV systems.
This is to limit the probability of vent or trap seal failure, which could lead to the entry of sewer gases into occupied space, which could lead to negative effects on indoor air quality, which could lead to harm to persons.
Top of Page