6.2.3.8.(11)ATTRIBUTION:
Functional Statement:
F81
To minimize the risk of malfunction, interference, damage, tampering, lack of use or misuse.
Objective:
OH1.2
APPLICATION:
Preventing condensation in exhaust ducts, in ventilating systems, containing air from heated spaces that
pass through or are adjacent to unheated spaces, in buildings described in Sentence
1.3.3.2.(1) of Division A.
This also applies to buildings to which Part 9 applies [see Sentence
1.3.3.3.(1) of Division A for application
of Part 9], with respect to:
- mechanical ventilating systems other than self-contained systems serving single dwelling units, as stated in Sentence 9.32.1.2.(2), and
- the ventilation of all occupancies other than residential occupancies, as stated in Sentence 9.32.1.1.(2).
INTENT:
To limit the probability that exhaust ducts will have inadequate
thermal resistance, which could lead to the excessive cooling of exhaust ducts,
which could lead to:
- the accumulation of condensation in exhaust ducts when temperatures are above the freezing point, or
- the freezing of accumulated condensation in exhaust ducts when temperatures are below the freezing point, which could lead to the buildup of ice in the ducts, which could lead to ducts being blocked, which could lead to inadequate ventilation.
This is to limit the probability of the inadequate
control of relative humidity or indoor air temperatures, which could lead
to the inadequate thermal comfort of persons, which could lead to harm to
persons.
ATTRIBUTION:
Functional Statement:
F81
To minimize the risk of malfunction, interference, damage, tampering, lack of use or misuse.
F44
To limit the spread of hazardous substances beyond their point of release.
Objective:
OH1.1
APPLICATION:
Preventing condensation in exhaust ducts, in ventilating systems, containing air from heated spaces that
pass through or are adjacent to unheated spaces, in buildings described in Sentence
1.3.3.2.(1) of Division A.
This also applies to buildings to which Part 9 applies [see Sentence
1.3.3.3.(1) of Division A for application
of Part 9], with respect to:
- mechanical ventilating systems other than self-contained systems serving single dwelling units, as stated in Sentence 9.32.1.2.(2), and
- the ventilation of all occupancies other than residential occupancies, as stated in Sentence 9.32.1.1.(2).
INTENT:
To limit the probability that exhaust ducts will have inadequate
thermal resistance, which could lead to the excessive cooling of exhaust ducts,
which could lead to the freezing of water vapour that condenses on the interior
surface of exhaust ducts, which could lead to:
- the blockage of ducts by ice buildup when temperatures are below the freezing point, which could lead to inadequate ventilation, or
- the growth of mould and mildew in ducts.
This is to limit the probability of negative
effects on the air quality of indoor spaces, which could lead to harm to persons.