Intent 1:
To limit the probability of the deterioration and
collapse of ducts, which could lead to reduced airflow, which could
lead to an inadequate delivery of air, which could lead to:
- inadequate ventilation,
- an inability to maintain the minimum indoor air temperatures
[see Sentence 9.33.3.1.(1)], or
- an inadequate supply of combustion air, which could
lead to incomplete combustion.
This is to limit the probability of:
- the inadequate control of airborne pollutants or relative
humidity, and oxygen and other components necessary for breathable
air,
- condensation, which could lead to:
- the generation of pollutants from biological growth
or from materials that become unstable on wetting, or
- the deterioration of building elements, or
- the entry of combustion products into living space.
This is to limit the probability of negative effects on
the air quality of indoor spaces, which could lead to harm to persons.