6.2.2.4.(3)ATTRIBUTION:
Functional Statement:
F52
To maintain appropriate relative humidity.
Objective:
OH1.1
APPLICATION:
Heating, ventilating and air-conditioning 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),
- the ventilation of all occupancies other than residential occupancies, as stated in Sentence 9.32.1.1.(2),
- heating systems, including requirements for combustion air, and air-conditioning systems other than those serving individual dwelling units, as stated in Sentence 9.33.1.1.(2), and
- air duct distribution systems serving heating systems in which the rated heat input exceeds 120 kW, as stated in Sentence 9.33.6.1.(2).
INTENT:
To limit the probability that the inappropriate design of
heating, ventilating and air-conditioning systems will lead to dampness, which
could lead to the contamination of system components, which could lead to
the growth of mould and mildew, which could lead to negative effects on the
air quality of indoor spaces, which could lead to harm to persons.