Sentence 9.21.4.6.(1)

  1. OS2
  2. OS1
  3. OP1
  4. OH1
  5. OS3

Objective

OS3 Safety in Use

Attribution

Intent

Intent 1:

To limit the probability that cracks in the masonry or gaps between the masonry and the liner will lead to the ingress of precipitation or melting snow into the chimney, which could lead to damage to the masonry or to the liner due to freeze-thaw stresses, which could lead to the leakage of carbon monoxide gas into living space, which could lead to the acute poisoning or asphyxiation of persons.

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