Back6.2.3.2.(4)

ATTRIBUTION:

Functional Statement:

F20

To support and withstand expected loads and forces.

F80

To resist deterioration resulting from expected service conditions.

Objective:

OH1.1, OH1.2

 

APPLICATION:

Duct materials in air duct distribution systems serving heating, ventilating and air-conditioning systems, in buildings to which Part 6 applies [see Sentence 1.3.3.2.(1) of Division A for application of Part 6].

INTENT:

To limit the probability that an inadequate resistance to moisture or corrosion will lead to condensation in ducts, which could lead to the deterioration and collapse of ducts, which could lead to a reduction in airflow, which could lead to:
  • the inadequate control of:
    • relative humidity or indoor air temperatures,
    • surface temperatures, or
    • air velocity,
  • the inadequate delivery of warm air or the return of cold air, which could lead to an inability to maintain adequate indoor air temperatures, or
  • inadequate ventilation, which could lead to the inadequate control of:
    • relative humidity, which could lead to condensation, which could lead to the growth of mould and mildew, or
    • airborne pollutants.
This is to limit the probability of:
  • negative effects on the air quality of indoor spaces, and
  • the inadequate thermal comfort of persons.
This is to limit the probability of harm to persons.