Intent 1:
To limit the probability that:
- the effects of flue gases (such as shrinkage, softening,
or glazing of mortar under in-service temperatures) will lead to corrosion
damage to the mortar, which could lead to thermal shock, which could
lead to failure, or
- flue gas condensate will leak from joints in chimney
liners, which could lead to corrosion or freeze-thaw damage to surrounding
masonry.
This is to limit the probability of
the spillage of combustion products, which could lead to the leakage
of carbon monoxide gas into living space, which could lead to the
acute poisoning or asphyxiation of persons.