OH1 Indoor Conditions



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.

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