This class includes :

Manufacture of steam or other vapor generators

Manufacture of auxiliary plant for use with steam generators: condensers, economizers, superheaters, steam collectors and accumulators

Manufacture of nuclear reactors, except isotope separators

The term "nuclear reactor " covers, in general, all the apparatus and appliances inside the area screened off by the biological shield, including , where appropriate the shield itself. The term also includes any other apparatus or appliances outside the area provided they form an integral part of those contained inside the screen.

Manufacture of parts for marine or power boilers

This class excludes :

Manufacture of central heating hot-water boilers and radiators, see 2512;

Manufacture of boiler-turbine sets, see 2811;

Manufacture of isotope separators, see 2829.