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 into living space, which could
lead to negative effects on the air quality of indoor spaces, which
could lead to harm to persons.