HS 842139 Other

Quick Answer: Machines and apparatus for filtering or purifying air, including those for mechanical filtration or purification, imported under HS 842139 enter the UK duty-free, the EU at rates up to 1.70% ad valorem, and the US at rates up to 35% ad valorem. This residual classification applies to air filtering or purifying machinery not specifically listed elsewhere in Chapter 84 of the Harmonized System. Importers should carefully review the specific subheadings within 8421.39 for each jurisdiction, as precise product descriptions and intended use can dictate the applicable duty rate. CustomTariffs aggregates this data, highlighting the need for due diligence to ensure correct classification and avoid potential penalties.

What Are the Import Duty Rates?

🇬🇧 United Kingdom

Code MFN Preferential Unit
8421393500
8421393510 0.00 %
8421393590 0.00 %
8421398500
8421398510 0.00 %

🇪🇺 European Union (TARIC)

Code MFN Preferential Unit
8421390000
8421391500 0.00 %
8421392500
8421392510
8421392590 1.70 %

🇺🇸 United States (HTSUS)

Code MFN Preferential Unit
8421390105 ["kg"]
84213901 Free
8421390115 ["kg"]
8421390120 ["No."]
8421390130 ["No."]

Duty rates sourced from the USITC (US International Trade Commission) Harmonized Tariff Schedule (HTS) (accessed 2/22/2026), EU TARIC – DG TAXUD (Directorate-General for Taxation and Customs Union) (accessed 2/22/2026), and UK Trade Tariff – HMRC (His Majesty's Revenue and Customs) (accessed 2/22/2026).

Data compiled and presented by HSRates.

How Has Trade Volume Developed?

How to Classify This HS Code?

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What products does HS 842139 cover?

This subheading covers other filtering or purifying machinery and apparatus for liquids or gases, not specifically enumerated in preceding subheadings of heading 8421. According to the WCO Harmonized System Explanatory Notes and definitions found in official tariff schedules like the USITC Harmonized Tariff Schedule (HTS) and the EU's TARIC, this category includes devices for filtering or purifying gases or liquids that do not fit into more specific classifications, such as air purifiers for general use, certain types of water filters not for drinking water, and gas purification systems for industrial processes. The key is that they perform a filtering or purifying function for gases or liquids.

What falls outside HS 842139?

The following products are excluded from HS 842139: machinery for filtering or purifying water for human consumption (often classified under 8421.21), oil or gas filters for internal combustion engines (typically 8421.31), and machinery for filtering or purifying air in specific applications like HVAC systems if they are considered part of a larger apparatus or have a more specific classification. For instance, a complete air conditioning unit with integrated filtration would not be classified here, nor would specialized laboratory filtration equipment that falls under other headings.

What are common classification mistakes for HS 842139?

A common error is misclassifying devices based on their intended use rather than their primary function. For example, a portable air purifier designed for personal use in a car might be incorrectly classified if its primary function is air purification and it doesn't fit a more specific subheading. Another mistake involves overlooking the specific exclusions in the Explanatory Notes, such as mistaking industrial gas scrubbers for general gas purifiers. Adherence to General Rule of Interpretation (GRI) 1, which states that classification is determined by the terms of the heading and any relative section or chapter notes, is crucial.

How should importers classify products under HS 842139?

The correct procedure for classifying products under HS 842139 involves a thorough examination of the product's design, function, and materials, comparing these against the WCO Explanatory Notes and the specific wording of the tariff schedule. Importers and customs brokers should consult the official tariff schedules of the importing country (e.g., USITC HTS, EU TARIC, UK Trade Tariff) and consider the specific purpose of the filtering or purifying apparatus. If the product is for filtering or purifying gases or liquids and is not explicitly covered by a more specific subheading within 8421, then 8421.39 is likely the correct classification.

How is the duty calculated for products under HS 842139?

A shipment of 100 units of a portable air purifier, each weighing 2 kg and declared at a customs value of $30 per unit (total value $3,000), would attract a US duty of $150. This is calculated using the MFN duty rate of 5% ad valorem, applied to the total declared value: 5% of $3,000 = $150. This is calculated using the MFN rate published in the USITC Harmonized Tariff Schedule for HS code 8421.39.9000.

Which trade agreements reduce duties for HS 842139?

Several free trade agreements may reduce the applicable duty rate for HS 842139, including the United States-Mexico-Canada Agreement (USMCA), which can lead to a 0% duty rate for qualifying goods originating from Canada or Mexico. The Generalized System of Preferences (GSP) may also offer reduced or duty-free entry for eligible products from designated developing countries, often requiring a GSP Form A. For goods originating in the European Union, the EU-US Trade Agreement (though currently limited in scope) or other bilateral agreements might apply, potentially reducing duties to Free, with documentation like an EUR.1 movement certificate or an origin declaration on the invoice being required depending on the specific agreement and jurisdiction.

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FAQ

What is the general Most Favored Nation (MFN) duty rate for HS code 842139?

The MFN duty rate for HS code 842139, which covers 'Other' filtering or purifying machinery and apparatus for liquids or gases, can vary significantly by importing country. For instance, the U.S. Harmonized Tariff Schedule (USHTS) lists a 0.00% duty rate for many goods under this code. However, other countries may apply different rates. For example, the UK Trade Tariff shows a 3.5% duty rate for certain goods classified here. It is crucial to consult the specific tariff schedule of the destination country for the precise MFN rate applicable to your product.

How is the duty calculated for an item classified under HS 842139 if a duty rate applies?

The duty calculation depends on whether the rate is ad valorem (a percentage of the value) or specific (a fixed amount per unit). For example, if a product classified under HS 842139 has an ad valorem duty rate of 1.70% and its customs value is $10,000, the duty would be calculated as: $10,000 (Customs Value) × 0.0170 (Duty Rate) = $170.00. If a specific duty applies, such as $5 per unit, and you import 100 units, the duty would be: 100 Units × $5/Unit = $500. Always refer to the specific tariff schedule for the applicable duty basis.

What are the classification criteria for goods falling under HS code 842139?

HS code 842139 is a residual category for filtering or purifying machinery and apparatus for liquids or gases that are not specifically covered by other subheadings within 8421. This means that if a machine or apparatus performs a filtering or purifying function for liquids or gases, and it does not fit into more specific headings like those for air filters (e.g., 8421.39.80 for the US, which covers air purification equipment), water filters, or oil filters, it will likely be classified under 842139. The key is the function of separation or purification of liquids or gases.

Are there preferential duty rates available for goods classified under HS 842139 through trade agreements?

Yes, preferential duty rates are often available for goods classified under HS 842139, depending on the origin of the goods and the trade agreements in force between the exporting and importing countries. For example, goods originating from countries with a Free Trade Agreement (FTA) with the United States may qualify for duty-free entry (0.00%) under specific provisions, even if the general MFN rate is higher or lower. Similarly, the EU TARIC system and the UK Integrated Online Tariff provide for preferential rates under agreements like the EU-UK Trade and Cooperation Agreement or other EU FTAs. Importers must ensure they have the necessary proof of origin documentation to claim these preferential rates.

What documentation is typically required for importing goods under HS code 842139?

Standard import documentation is generally required for goods classified under HS code 842139. This includes a commercial invoice detailing the value, quantity, and description of the goods; a packing list; and a bill of lading or air waybill. Depending on the importing country and the specific nature of the filtering apparatus, additional documentation might be necessary. This could include a certificate of origin to claim preferential duty rates, safety certifications, or specific declarations related to the materials used or the intended application of the filtering equipment. Always verify the specific requirements with the customs authorities of the destination country.