7
Machine tools and industrial machines; motors and engines (except for land vehicles); fans for engines motors for fans and for apparatus and installations for air conditioning; heat exchangers (parts of machines); filters being parts of machines or engines
11
Apparatus for lighting, heating, steam generating, cooking, refrigerating, drying, ventilating, water supply and sanitary purposes; desalination plants; cooling appliances and installations; cooling towers; distillation apparatus; heat exchangers (not parts of machines); air-conditioning apparatus and installations; air cooling apparatus and installations; fans (air conditioning), fans (parts of air conditioning installations); electrostratic dust removing apparatus; apparatus and installations for removing sulphur from smoke; air cleaning and purifying apparatus and installations; air filtering installations; filters for air conditioning apparatus and installations; filters for air cooling apparatus and installations; gas scrubbing equipment (gas scrubbers); filters (parts of industrial installations)
37
Repair and maintenance of buildings; assembly, cleaning, maintenance and repair of installations for heating, ventilating, air conditioning, refrigerating, heat, of heat exchangers, and of cooling installations and cooling towers; Machinery maintenance and repair; rental of machines and tools for construction; turnkey construction of cooling towers and cooling installations
42
Planning and consultancy for building and construction; construction drafting and consultancy in relation to the assembly of heat exchangers, cooling installations and cooling towers; services of architects, chemists, physicists, engineers and surveyors; computer programming; drawing up surveys by engineers or laboratories; technical consultancy services relating to civil engineering; materials testing; thermal performance testing; inspection (quality control) of installations for heating, ventilating, refrigerating, of heat exchangers and of cooling installations and cooling towers; technical project studies and technical project management for the design and quality improvement of cooling towers and cooling installations, air pollution control systems and heat exchangers; feasibility studies in the field of the construction, assembly and improvement of cooling towers, cooling installations and air pollution control systems; engineering; analysis and research in the fields of air pollution control and cooling