6
Common metals and their alloys; Metal building materials, In particular daylight systems, Skylights, Skylights, Lighting strips, Flat roof windows, roof lights, Skylight upstands for lighting, profile rails for connecting roofing felt to light dome upstands, daylight channelling systems, Smoke outlets [vents] of metal, Heat vents of metal, smoke aprons of metal, building openings for smoke discharge and facade ventilation, drainage pipes and draining profiles of metal being drainage systems for flat roofs, gullies for flat roofs, gullies for balconies, fittings for roof exits and roof entries
11
Smoke exhaust systems, Installations for airing
19
Light domes and skylight upstands for lighting the spaces situated below (not of metal); Openers and accessories for light domes (not of metal), namely manual opening devices for light domes; Fittings for roof exits and roof entries, not of metal, profile rails for connecting roofing felt to light dome upstands, not of metal; Daylight systems, casement windows, not of metal, light domes, not of metal, strip lights, not of metal, flat roof windows, not of metal, roof windows, not of metal; Flues (ventilations), not of metal, heat vents, not of metal, smoke aprons, not of metal, building openings for smoke discharge and facade ventilation, not of metal; Drainage systems for flat roofs, not of metal, gullies for flat roofs, not of metal, gullies for balconies, not of metal