Intent 1:
To limit the probability that the performance of
vents will fall significantly below expectations with respect to:
- material integrity and durability, including corrosion
resistance, which could lead to the premature failure of vents,
- flashing provided by flanges,
- wind and rain resistance,
- protection against the ingress of insects or vermin,
and
- net ventilating area.
This is to limit the probability of:
- precipitation ingress,
- an infestation of insects or vermin, and
- insufficient venting, which could lead to:
- condensation, or
- the formation of ice dams, which could lead to the ingress
of water.
This is to limit the probability of:
- compromised thermal performance of components intended
to provide resistance to heat transfer, which could lead to an inadequate
control of the temperature of interior spaces,
- the generation of pollutants from insects or biological
growth or from materials that become unstable on wetting,
- deterioration, which could lead to compromised integrity
of ceilings acting as environmental separators, or
- water accumulation in interior spaces.
This is to limit the probability of:
- negative effects on the air quality of indoor spaces,
- the inadequate thermal comfort of persons, and
- contact with moisture.
This is to limit the probability of harm to persons.