OH1 Indoor Conditions



Intent 1:

To limit the probability that:

  • hydraulic load from fixtures discharging simultaneously will lead to siphonic action or back pressures,
  • discharge from water closets will lead to the siphonage of downstream traps,
  • hydraulic load from fixtures located on higher storeys will lead to trap seal failure due to compression of air below the connection, or
  • the failure of wet vent sections to conform to wet vent requirements will lead to siphonic action or back pressures.

This is to limit the probability of trap seal failure in a vent stack that functions as a wet vent, 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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