Intent 1:
To limit the probability of excessive or insufficient
airflow.
This is to limit the probability of:
- the inadequate control of airborne pollutants or oxygen
and other components necessary for breathable air,
- the inadequate control of relative humidity,
- excessive negative pressure, or
- excessive positive pressure.
This is to limit the probability of:
- condensation within assemblies, which could lead to
the generation of pollutants from biological growth or from materials
that become unstable on wetting,
- moisture ingress from the ground,
- the ingress of soil gases (such as methane and radon),
- the spillage of combustion products from fuel-burning
appliances that are susceptible to spillage, or
- drafts.
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.