43   Purpose of Part 4

(1)  The purpose of this Part is to regulate:

(a)  the installation on premises of certain kinds of systems, and

(b)  the operation and maintenance of those kinds of systems installed on premises, whether the installation took place before, or takes place after, the commencement of this Part,

      in order to prevent or inhibit the growth in the systems of micro-organisms that are liable to cause Legionnaires’ disease and other diseases.

(2)  The systems comprise:

(a)  air-handling systems, and

(b)  evaporative cooling systems, and

(c)  hot-water systems, and

(d)  humidifying systems, and

(e)  warm-water systems, and

(f)  water-cooling systems,

      and their associated equipment and fittings.