6 Ducts of metal for ventilating and air conditioning installations; pipes of metal for central heating installations; drain pipes of metal; water-pipes of metal; nets and gratings of metal; wall linings of metal; wire gauze and wire cloth; trellis of metal; tubes of metal; flexible tubes of metal; pipes and tubes of metal.
11 Apparatus and installations for refrigerating, freezing, climatisation, drying, ventilating, steam generating and air conditioning; water softening apparatus and installations, hot air ovens, apparatus and machines for purification of water and of air, air cooling apparatus, filters for air conditioning; water conduits installations, dust removing installations for industrial purposes, water distribution and production installations, filtration apparatus, evaporators, humidifiers, air heaters, heat regenerators, air processing chambers, diffusers of air via textile tubing, dessiccating units (apparatus), cooling tunnels, stoves (heating apparatus); water-pipes for sanitary installations.
17 Metal foil for insulation; insulating materials; insulating fabric; waterproof or insulating packings; hoses of textile material; flexible pipes and goods, not of metal.
19 Transportable buildings not of metal, partitions not of metal; pipes and tubes, not of metal; buildings, not of metal; inflatable buildings; inflatable constructions; lattice work and trellises, not of metal; pipes and tubes, not of metal and not of plastic.
22 Tarpaulins; textile fibres; nets; padding and stuffing materials, tents.
24 Canvases, fabrics and technical coverings for industrial purposes, protective covers for industrial purposes, trellises.