6.2.3.8.(4)ATTRIBUTION:
Functional Statement:
F81
To minimize the risk of malfunction, interference, damage, tampering, lack of use or misuse.
Objective:
OH1.1
APPLICATION:
Backdraft prevention for exhaust outlets of ventilating
systems, 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),
- the ventilation of storage garages for more than 4 motor vehicles in residential occupancies, as stated in Sentence 9.32.1.1.(3), 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, under windy conditions, exhausted
contaminants will re-enter the building, which could lead to negative effects
on the air quality of indoor spaces, 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.
Objective:
OH1.2
APPLICATION:
Backdraft prevention for exhaust outlets of ventilating
systems, 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),
- the ventilation of storage garages for more than 4 motor vehicles in residential occupancies, as stated in Sentence 9.32.1.1.(3), 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 air will infiltrate the building
when exhaust fans are not in operation, which could lead to the inadequate
control of indoor air temperatures, which could lead to the inadequate thermal
comfort of persons, which could lead to harm to persons.