Intent 1:
To limit the probability of the escape of water
vapour from ducts, which could lead to such vapour condensing and
freezing on duct surfaces or within insulation, which could lead to:
- the wetting of building elements, which could lead to
corrosion, rotting or mould and mildew growth, or
- the sagging and collapse of ducts.
This is to limit the probability of:
- an inability to maintain the minimum indoor air temperatures
[see Sentence 9.33.3.1.(1)], or
- inadequate ventilation.
This is to limit the probability of:
- the inadequate control of airborne pollutants or relative
humidity, or
- inadequate combustion air for fuel-burning appliances,
which could lead to incomplete combustion.
This is to limit the probability of:
- the generation of pollutants from biological growth
or from materials that become unstable on wetting,
- 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,
or
- the inadequate thermal comfort of persons.
This is to limit the probability of harm to persons.