Industry
Ventilation ducts, sheet metal, Metal constructions for the building industry, Construction, Flue and chimney linings, metal, Heating and aeration equipment, metal, Air inlets and outlets (registers), metal, for ventilation systems, Pipes, ferrous, for aeration and ventilation, Metal pipework, valves and containers, Pipes, tubes, ducts and pipelines, ferrous metals, by use, Pipe, tube and hose joints, metal