5. Section 5 of the Building Act is amended—
(a) by adding at the end of subparagraph (c) (i) of the definition of “building work” in subsection (1) “or”;
(b) by omitting subparagraph (c) (iii) of the definition of “building work” in subsection (1);
(c) by omitting from subsection (1) the definitions of “applicable standard” and “mechanical ventilation system” and substituting respectively the following definitions:
“ ‘applicable standard' means Australian Standard 3666-1989, as amended for the purposes of this Act under section 6B and section 42N (before its repeal);
‘mechanical ventilation system' includes—
(a) an air-handling system within the meaning of the applicable standard;
(b) a condenser within the meaning of the applicable standard; and
(c) a cooling tower within the meaning of the applicable standard;”;
(d) by omitting from subsection (1) the following definitions:
“hazardous substance”;
“initial standard”;
“system licence”;
“unacceptable Legionella levels”; and
(e) by omitting subsection (6).