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MISCELLANEOUS ARTICLES OF BASE METAL›Flexible tubing of base metal, with or without fittings
Of other base metal
Scope and material characteristics of CN 830790
CN code 830790 covers flexible tubes and protective conduit made of base metals other than iron and steel. The most common materials are aluminium, copper, nickel, zinc and their alloys. Flexible aluminium ventilation ducts represent one of the most commercially significant product categories in this group, widely used in HVAC systems, kitchen ventilation and exhaust applications. Copper flexible tubing is valued for its excellent thermal conductivity and corrosion resistance, making it ideal for refrigeration and gas piping systems. Nickel flexible tubing is used in the chemical industry where resistance to aggressive media is essential. All products in this group share the common property of flexibility, enabling easy installation in confined or irregular spaces where rigid tubing would be impractical.
Applications in ventilation, refrigeration and industry
Aluminium flexible ducts classified under CN 830790 are a key component in ventilation systems for residential, commercial and industrial buildings. They are used to distribute conditioned air from air handling units, connect diffusers and grilles, and route exhaust air from tumble dryers and kitchen extractor hoods. In the refrigeration and air conditioning industry, flexible copper connections are widely used for linking compressors and condensers. The automotive industry uses aluminium flexible hoses for intercooler and turbocharger air intake connections. The food and pharmaceutical industries prefer corrosion-resistant metal flexible tubing that meets hygiene requirements. The low density of aluminium enables the production of long flexible duct sections while maintaining a manageable weight, which is a practical advantage during installation.
Customs and import documentation aspects
Classification under CN code 830790 requires confirmation that the dominant metal is a base metal other than iron or steel. In customs practice, a material composition certificate or manufacturer's technical specification is essential. Aluminium flexible ducts must be distinguished from plastic ducts coated with aluminium foil, which fall under different tariff codes based on the classification of their primary structural material. Goods imported into the EU from certain countries may be subject to anti-dumping measures, particularly for aluminium products, and current EU regulations should be verified before import. For importers, an accurate customs value declaration and origin documentation are critical, especially given that origin rules for aluminium flexible ducts can be complex when production involves multiple stages across different countries.
Non-ferrous metal hoses - industrial applications
CN code 8307 90 covers flexible tubing of other metals of base metal. Import into the EU is subject to standard TARIC duty rates. Products must meet relevant EN standards and REACH requirements for chemical substances in metals. Customs declarations require a commercial invoice, certificate of origin and manufacturer's declaration of conformity.
Frequently asked questions
Are aluminium dryer vent hoses classified under CN 830790?
Yes, flexible aluminium ventilation hoses used in tumble dryers, kitchen extractor hoods and mechanical ventilation systems are typical products classified under CN code 830790, provided they are made of aluminium or another base metal other than iron or steel. Hoses made primarily of plastic with a metallic foil facing may be classified differently, which is why the material composition of the primary load-bearing structure of the product is the decisive classification criterion.
Which metals qualify a product for CN code 830790?
CN code 830790 covers flexible tubing made of all base metals except iron and steel. In practice, these are most commonly aluminium, copper, brass, nickel, titanium, zinc and alloys of these metals. A product made of iron or steel, including stainless steel, is classified under CN code 830710. The chemical composition of the material forming the main load-bearing structure of the flexible tube is the decisive classification factor.
Are copper flexible hoses for air conditioning covered by CN 830790?
Flexible copper tubes intended for air conditioning and refrigeration installations may be classified under CN code 830790 where they correspond to the definition of flexible tubing of base metals. However, it is necessary to verify whether specific copper products should instead be classified within the section covering copper and its alloys, or under headings relating to pipe fittings. In case of doubt, obtaining Binding Tariff Information ruling from the relevant customs authority is strongly recommended.
What duty rate applies to flexible tubing of other metals CN 8307 90?
The duty rate for flexible tubing of other metals CN 8307 90 is set by TARIC and depends on the country of origin. Preferential rates may apply under EU trade agreements.
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