18. (1) A system licence in force under the unamended Building Act immediately before the commencement day continues in force on and after that day as if it had been granted as an activity licence under section 30 of the new Public Health Act in relation to the public health risk activity referred to in section 17 of this Act.
(2) An activity licence referred to in subsection (1) is—
(a) subject to the same conditions (if any) as the corresponding system licence, in addition to the condition referred to in subsection (3);
(b) to be taken to have been granted for the period expiring on the date on which the corresponding system licence under the unamended Building Act would have otherwise expired; and
(c) otherwise subject to the new Public Health Act.
(3) An activity licence referred to in subsection (1) in relation to a specialised system is to be taken to have been granted subject to the condition that any maintenance, cleaning or structural modification of the system is only to be carried out in accordance with the written approval of the Minister.
(4) An activity licence referred to in subsection (1) may be renewed under section 33 of the new Public Health Act for a period determined by the Minister.
(5) If a suspension was in force under the unamended Building Act in relation to a system licence immediately before the commencement day—
(a) this section applies in relation to the licence; and
(b) the suspension remains in force under the new Public Health Act—
(i) in the case of a suspension on a ground specified in paragraph 42J (1) (a), (b) or (c) of the unamended Building Act—until the Minister gives written notice to the licensee that he or she has reasonable grounds for believing that the ground for suspension of the licence no longer exists; or
(ii) in any other case—for the period referred to in paragraph 42J (7) (b) of the unamended Building Act.