Provision of access for the inspection, maintenance, repair and cleaning of equipment requiring periodic maintenance and forming part of heating, ventilating or 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).

To limit the probability that the inaccessibility of heating, ventilating or air-conditioning system components will lead to inadequate inspection, maintenance, repair or cleaning, which could lead to performance that falls significantly below expectations, which could lead to fire hazards [e.g. the release of flammable gases in buildings], which could lead to fire, which could lead to harm to persons.