6
Ventilation systems and ventilation fittings of metal or substantially of metal with and without seals, dampers, connectors; pipes, tubes, ducts of metal; flow control and gas mixing valves; dampers, grilles, connectors, fasteners and suspensions of metal for use in ventilation, air-conditioning, warm-air heating and exhaust systems; parts of and fittings for all the aforesaid goods; sheets and plates of metal; building materials, building elements or building components of metal or substantially of metal and their alloys
7
Sheet metal cutting and forming machinery; machines and machine tools for use in the sheet metal industry, including machines for the manufacture of helically formed metal tubing and ducting, cutting machines, elbow making machines, rollforming machines, stitchwelding machines, bending machines, flanging and locking machines; machines and machine tools for use in the manufacturing of heating, ventilation and air conditioning (HVAC) products, elements and components, and parts and fittings therefor; motors and engines (except for land vehicles); machines, tools and apparatus for fastening and jointing; parts of and fittings for all the aforesaid goods
11
Ventilation, air-conditioning, warm-air heating and exhaust installations, apparatus and systems as well as parts of and fittings for all the aforesaid goods; pipes, tubes, tubing, ducts, ducting, flow control and gas mixing valves, all being parts of ventilation, air-conditioning, warm-air heating or exhaust systems; silencers for ventilation systems; parts of and fittings for all the aforementioned goods