Subheading · Chapter 84 · Heading 8421
8421.39: Filtering or purifying machinery and apparatus for gases: other
Other gas filtering and purifying machinery
Official description Other
8421.39 is the HS subheading for other gas filtering and purifying machinery, under heading 8421 in chapter 84.
What you pay
Importing into UK
Rates by national line · UK Global Tariff
UK lines →- 8421 39 00 00 Other
- 8421 39 15 00 With stainless steel housing, and with inlet and outlet tube bores with inside diameters not exceeding 1.3 cm Free
- Other
- 8421 39 25 00 Machinery and apparatus for filtering or purifying air
- 8421 39 25 10 For use in civil aircraft Free
- 8421 39 25 90 Other Free
- Machinery and apparatus for filtering or purifying other gases
- 8421 39 35 00 By a catalytic process
- 8421 39 35 10 For use in civil aircraft Free
- 8421 39 35 90 Other Free
- 8421 39 85 00 Other
- 8421 39 85 10 For use in civil aircraft Free
- 8421 39 85 90 Other Free
Additional duties and import rules
Charges on top of the customs duty, and rules the goods must meet at the border.
Additional duties and charges 3
- Additional dutyAdditional duties 35%
- Applies to goods from
- Belarus, Russia
- Legal act
- 2022 No. 376
- Documents
- 9008
- Duty suspensionAirworthiness tariff suspension Free
- Applies to goods from
- all countries
- Legal act
- S.I. 2018/1249
- Documents
- C119 Authorised Release Certificate — EASA Form 1 (Appendix I to Annex I to Regulation (EU) No 748/2012), or equivalent certificate
- Duty suspensionSuspension - goods for certain categories of ships, boats and other vessels and for drilling or production platforms Free
- Applies to goods from
- all countries
- Legal act
- 2020 No. 1431
- Documents
- C990 End use authorisation ships and platforms (Column 8c, Annex A of Delegated Regulation (EU) 2015/2446)
- Tariff lines
- on 3 of 7 lines
Import requirements 3
- Prohibition or restrictionImport prohibition
- Applies to goods from
- North Korea
- Legal act
- S.I. 2019/411
- Import controlRestriction on entry into free circulation
- Applies to goods from
- Russia, Syria, Ukraine
- Legal act
- 2023 No. 440, S.I. 2019/792, S.I. 2022/395
- Documents
- 9011
- 9022
- 9038
- 9009
- 9010
- 9017
- Import controlImport control on restricted goods and technologies
- Applies to goods from
- Iran, Libya, North Korea, Russia
- Legal act
- S.I. 2019/461, S.I. 2019/411, 2020 No. 1665, S.I. 2019/855
- Documents
- Y966 Goods other than those described in the MG footnotes linked to the measure (Missile Technology Control Regime list - Annex III of Reg. (EU) 267/2012)
- Y920 Goods other than those described in the footnotes linked to the measure
Preferential rates by country
| Agreement or scheme | Countries | Rate |
|---|---|---|
| standard rate (no agreement) | — | Free |
| DCTS Comprehensive | Afghanistan, Angola, Bangladesh, Benin and 38 moreAfghanistan, Angola, Bangladesh, Benin, Bhutan, Burkina Faso, Burundi, Cambodia, Central African Republic, Chad, Comoros, Congo - Kinshasa, Djibouti, Eritrea, Ethiopia, Gambia, Guinea, Guinea-Bissau, Haiti, Kiribati, Laos, Liberia, Malawi, Mali, Mauritania, Myanmar (Burma), Nepal, Niger, Rwanda, São Tomé & Príncipe, Senegal, Sierra Leone, Somalia, South Sudan, Sudan, Tanzania, Timor-Leste, Togo, Tuvalu, Uganda, Yemen, Zambia | Free |
| European Union (including code "EU") | Free | |
| DCTS Enhanced | Algeria, Bolivia, Cape Verde, Congo - Brazzaville and 13 moreAlgeria, Bolivia, Cape Verde, Congo - Brazzaville, Cook Islands, Kyrgyzstan, Micronesia, Mongolia, Nigeria, Niue, Pakistan, Philippines, Sri Lanka, Syria, Tajikistan, Uzbekistan, Vanuatu | Free |
| CARIFORUM | Antigua & Barbuda, Bahamas, Barbados, Belize and 10 moreAntigua & Barbuda, Bahamas, Barbados, Belize, Dominica, Dominican Republic, Grenada, Guyana, Jamaica, St Kitts & Nevis, St Lucia, St Vincent & the Grenadines, Suriname, Trinidad & Tobago | Free |
| OCTs (Overseas Countries and Territories) | Anguilla, Bermuda, British Indian Ocean Territory, British Virgin Islands and 7 moreAnguilla, Bermuda, British Indian Ocean Territory, British Virgin Islands, Cayman Islands, Falkland Islands, Montserrat, Pitcairn Islands, South Georgia & South Sandwich Islands, St Helena, Turks & Caicos Islands | Free |
| Central America | Costa Rica, El Salvador, Guatemala, Honduras, Nicaragua, Panama | Free |
| SADC EPA | Botswana, Eswatini, Lesotho, Mozambique, Namibia | Free |
| Eastern and Southern Africa States | Madagascar, Mauritius, Seychelles, Zimbabwe | Free |
| CPTPP | Brunei, Malaysia | Free |
| UK–Andorra agreement | Andorra | Free |
| UK–Albania agreement | Albania | Free |
| UK–Australia agreement | Australia | Free |
| UK–Canada agreement | Canada | Free |
| UK–Switzerland agreement | Switzerland | Free |
| UK–Côte d’Ivoire agreement | Côte d’Ivoire | Free |
| UK–Chile agreement | Chile | Free |
| UK–Cameroon agreement | Cameroon | Free |
| UK–Colombia agreement | Colombia | Free |
| UK–Ceuta & Melilla agreement | Ceuta & Melilla | Free |
| UK–Ecuador agreement | Ecuador | Free |
| UK–Egypt agreement | Egypt | Free |
| UK–Fiji agreement | Fiji | Free |
| UK–Faroe Islands agreement | Faroe Islands | Free |
| UK–Georgia agreement | Georgia | Free |
| UK–Ghana agreement | Ghana | Free |
| DCTS Standard | Indonesia | Free |
| UK–Israel agreement | Israel | Free |
| UK–India agreement | India | Free |
| UK–Iceland agreement | Iceland | Free |
| UK–Jordan agreement | Jordan | Free |
| UK–Japan agreement | Japan | Free |
| UK–Kenya agreement | Kenya | Free |
| UK–South Korea agreement | South Korea | Free |
| UK–Lebanon agreement | Lebanon | Free |
| UK–Liechtenstein agreement | Liechtenstein | Free |
| UK–Morocco agreement | Morocco | Free |
| UK–Moldova agreement | Moldova | Free |
| UK–North Macedonia agreement | North Macedonia | Free |
| UK–Mexico agreement | Mexico | Free |
| UK–Norway agreement | Norway | Free |
| UK–New Zealand agreement | New Zealand | Free |
| UK–Peru agreement | Peru | Free |
| UK–Papua New Guinea agreement | Papua New Guinea | Free |
| UK–Palestinian Territories agreement | Palestinian Territories | Free |
| UK–Serbia agreement | Serbia | Free |
| UK–Solomon Islands agreement | Solomon Islands | Free |
| UK–Singapore agreement | Singapore | Free |
| UK–San Marino agreement | San Marino | Free |
| UK–Tunisia agreement | Tunisia | Free |
| UK–Türkiye agreement | Türkiye | Free |
| UK–Ukraine agreement | Ukraine | Free |
| UK–Vietnam agreement | Vietnam | Free |
| UK–Samoa agreement | Samoa | Free |
| UK–Kosovo agreement | Kosovo | Free |
| UK–South Africa agreement | South Africa | Free |
UK: imports by month
Main suppliers, last 12 months
| Country | Value | Share | Change |
|---|---|---|---|
 Germany | £116m | 19% | -30.2% |
 United States | £98.8m | 16.2% | +14.9% |
 China | £58.5m | 9.6% | -31.1% |
 Romania | £44.6m | 7.3% | -80.4% |
 Poland | £41m | 6.7% | +3.1% |
 Czechia | £34.4m | 5.6% | -14.7% |
| United Kingdom | £34m | 5.6% | +2.8% |
 Austria | £18.9m | 3.1% | +16.8% |
Same subheading in other tariffs
EU
TürkiyeWorld trade in 2024
Trade value (US$) no reported trade < US$111kUS$111k+US$8m+US$206m+> US$651m
Exports: 203
- Germany: US$4bn
- China: US$3bn
- United States: US$2bn
- Poland: US$1bn
- United Kingdom: US$920m
- South Korea: US$814m
- Czechia: US$651m
- Italy: US$636m
- Malaysia: US$523m
- Japan: US$519m
- Mexico: US$503m
- France: US$481m
- Romania: US$439m
- Netherlands: US$392m
- Canada: US$354m
- Belgium: US$347m
- Switzerland: US$247m
- Slovakia: US$241m
- Sweden: US$232m
- Türkiye: US$223m
- Thailand: US$206m
- Austria: US$202m
- India: US$194m
- Vietnam: US$166m
- Taiwan: US$161m
- Brazil: US$161m
- Portugal: US$139m
- Spain: US$135m
- South Africa: US$132m
- Indonesia: US$101m
- Denmark: US$98m
- Norway: US$77m
- Hungary: US$75m
- Slovenia: US$70m
- United Arab Emirates: US$65m
- Singapore: US$57m
- Finland: US$49m
- Russia: US$44m
- Lithuania: US$40m
- Latvia: US$33m
- Australia: US$28m
- Israel: US$28m
- Tunisia: US$24m
- Ireland: US$22m
- Estonia: US$17m
- Bosnia & Herzegovina: US$15m
- Croatia: US$13m
- Hong Kong SAR China: US$11m
- Bulgaria: US$11m
- Philippines: US$8m
- Morocco: US$8m
- Guatemala: US$8m
- Serbia: US$7m
- New Zealand: US$5m
- Greece: US$5m
- Ukraine: US$5m
- Kazakhstan: US$4m
- Cambodia: US$4m
- Argentina: US$3m
- North Macedonia: US$3m
Trade value (US$) no reported trade < US$4mUS$4m+US$43m+US$242m+> US$646m
Imports: 220
- United States: US$3bn
- Germany: US$2bn
- China: US$1bn
- United Kingdom: US$1bn
- Canada: US$872m
- France: US$760m
- Mexico: US$646m
- Poland: US$559m
- Taiwan: US$533m
- Netherlands: US$518m
- Japan: US$486m
- Belgium: US$459m
- Spain: US$451m
- South Korea: US$447m
- Italy: US$427m
- Singapore: US$416m
- Australia: US$383m
- Türkiye: US$347m
- Indonesia: US$341m
- India: US$340m
- Czechia: US$332m
- Switzerland: US$242m
- Brazil: US$237m
- Malaysia: US$232m
- Romania: US$230m
- Austria: US$225m
- Hong Kong SAR China: US$207m
- Saudi Arabia: US$205m
- Thailand: US$203m
- Slovakia: US$199m
- Sweden: US$196m
- Vietnam: US$192m
- Hungary: US$191m
- United Arab Emirates: US$188m
- Kazakhstan: US$167m
- Russia: US$126m
- Norway: US$120m
- Ireland: US$115m
- Denmark: US$114m
- South Africa: US$114m
- Finland: US$99m
- Liberia: US$79m
- Israel: US$78m
- Argentina: US$76m
- Egypt: US$55m
- Qatar: US$54m
- Uzbekistan: US$54m
- Philippines: US$52m
- Chile: US$51m
- Ukraine: US$50m
- Greece: US$50m
- Portugal: US$50m
- Morocco: US$49m
- Iraq: US$46m
- Nigeria: US$43m
- Peru: US$43m
- Panama: US$39m
- Colombia: US$39m
- Angola: US$39m
- Serbia: US$38m
Top exporters
| Rank | Country | Value | Share |
|---|---|---|---|
| 1 | Germany | US$4bn | 17.2% |
| 2 | China | US$3bn | 16.6% |
| 3 | United States | US$2bn | 12.1% |
| 4 | Poland | US$1bn | 5.1% |
| 5 | United Kingdom | US$920m | 4.5% |
| 6 |  South Korea | US$814m | 4% |
| 7 | Czechia | US$651m | 3.2% |
| 8 |  Italy | US$636m | 3.1% |
| 9 |  Malaysia | US$523m | 2.6% |
| 10 |  Japan | US$519m | 2.5% |
Top importers
| Rank | Country | Value | Share |
|---|---|---|---|
| 1 | United States | US$3bn | 13.9% |
| 2 | Germany | US$2bn | 8.2% |
| 3 | China | US$1bn | 5.3% |
| 4 | United Kingdom | US$1bn | 5% |
| 5 |  Canada | US$872m | 4.3% |
| 6 |  France | US$760m | 3.7% |
| 7 |  Mexico | US$646m | 3.2% |
| 8 | Poland | US$559m | 2.7% |
| 9 |  Taiwan | US$533m | 2.6% |
| 10 |  Netherlands | US$518m | 2.5% |
Binding rulings for similar goods 42
Decisions of U.S. Customs and Border Protection (CROSS) and HMRC (Advance Tariff Rulings) on goods classified here. A ruling binds only its holder, but shows how the authorities classify similar goods. The descriptions are the authorities’ own, in English.
- N361448 U.S. CBP
The tariff classification of Isolators from Ireland
- N361279 U.S. CBP
The tariff classification of replacement air filters from China
- N359872 U.S. CBP
The tariff classification of a disposable CLIC absorber from Germany
- N355172 U.S. CBP
The tariff classification of filters from Italy
- N354046 U.S. CBP
The tariff classification of a maintenance kit
- N349421 U.S. CBP
The tariff classification of regenerative thermal oxidizer units from Canada
- 600015177 HMRC
The suction cartridge filter and manifold are accessories for regenerative blowers, designed to ensure efficient operation and long-lasting performance. The suction cartridge filter features a high-quality paper element protected by a painted steel cover, safeguarding it from atmospheric…
- 600014981 HMRC
The product is an IFU Insertion Filter which is an inline air filtration unit intended for small ventilation systems for rough filtration. It consists of a galvanized steel circular housing fitted with a removable cassette containing a coarse (G3) filter. It is secured by a fine-meshed net with…
- 600013326 HMRC
Direct Fired Thermal Oxidiser (DFTO) For Air Pollutants In Plastic Pyrolysis Plant Part of the design of Pyrolysis technology which is making PPO (Plastic Pyrolysis Oil) from chemically processing single use plastic. The Thermal Oxidiser will ensure that no hazardous gases are released into the…
- 600011727 HMRC
The product is an air purifier, a heater and a cooling fan. Air is drawn into the product and passed through the integrated filtration system. The sensors located in the product senses microscopic particles, gases, Volatile Organic compounds (VOC), NO2, Temperature, Relative Humidity (RH) and…
- 600010076 HMRC
The product is a particulate filter designed for the purification of air entering a motor vehicle. It is a replaceable filter element used to purify air into the cabin of the vehicle, including particulate matter in the outside air, however, its primary use is as a filter for dust, dirt and…
42 rulings in total for this code
In the UK Global Tariff, subheading 8421.39 covers 7 tariff lines and the duty is duty-free.
The EU Combined Nomenclature divides subheading 8421.39 into 4 tariff lines; the duty is between 0% and 1.7% (average 1.3%). 1 of them is duty-free.
Goods from 174 countries can enter the UK at a preferential rate instead of the standard Free; 174 of them pay no duty at all, for example under DCTS Comprehensive or European Union.
In the UK, additional duty of 35% applies on top of the customs duty to goods from Belarus and Russia.
In the 12 months to August 2026, the UK imported other gas filtering and purifying machinery worth £611m (down 30% on the year before), at an average of £24.23 per kg; Germany supplied 19%, followed by United States.
World trade in other gas filtering and purifying machinery reached US$20bn in 2024, down 2.8% on 2023.
Germany was the largest exporter with 17.2% of the total, ahead of China.
Products classified here
Questions and answers
What is the HS code for filtering or purifying machinery and apparatus for gases: other?
Filtering or purifying machinery and apparatus for gases: other fall under HS subheading 8421.39, part of heading 8421, in section XVI of the Harmonized System.
What is the import duty on filtering or purifying machinery and apparatus… in the UK?
Under the UK Global Tariff, imports under 8421.39 from countries without a preferential agreement are free of duty. Preferential rates, anti-dumping duties and VAT are not included.
What is the import duty on filtering or purifying machinery and apparatus… in the EU?
Under the EU Combined Nomenclature, imports under 8421.39 from countries without a preferential agreement are charged at 0% to 1.7%, depending on the line. Preferential rates, anti-dumping duties and VAT are not included.
Which country exports the most filtering or purifying machinery and apparatus…?
Germany, with US$4bn in 2024 (17.2% of world exports).
Which countries can export other gas filtering and purifying machinery to the UK duty-free?
174 countries pay no duty under a trade agreement or preference scheme, among them partners under DCTS Comprehensive, European Union, DCTS Enhanced. The goods must meet the agreement’s rules of origin and the importer needs proof of origin; otherwise the standard rate of Free applies. Pick a country above to see its rate.
Is there anti-dumping duty on other gas filtering and purifying machinery?
The UK charges additional duty of 35% on goods from Belarus and Russia. Lower rates apply to the named exporters listed in the measure.
Where does the UK import other gas filtering and purifying machinery from?
In the 12 months to August 2026, the largest suppliers were Germany (19%), United States (16%) and China (10%), out of total imports of £611m.