HS code · 6-digit subheading
HS Code 8421.39 – Machinery; for filtering or purifying gases, other than intake air filters, catalytic converters or particulate filters for internal combustion engines
HS code 8421.39 is the 6-digit subheading for machinery, for filtering or purifying gases, other than intake air filters, catalytic converters or particulate filters for internal combustion engines. It is used for HEPA filters, industrial dust collectors, compressed air filters, gas scrubbers and fume extractors.
What HS 8421.39 covers
This HS code is a broad residual category for machinery used in filtering or purifying gases, excluding intake air filters, catalytic converters, or particulate filters for internal combustion engines. This encompasses a vast array of industrial, commercial, and medical gas filtration systems. Products under this code are essential for maintaining air quality in manufacturing facilities, cleanrooms, hospitals, and HVAC systems, as well as for purifying process gases in various industries. Importers include industrial plants, HVAC contractors, medical facilities, and specialized equipment distributors. Exporters are typically countries with strong industrial manufacturing bases and expertise in environmental control technologies, reflecting the diverse applications and critical importance of clean air and gas in modern society.
- Covers
- HEPA filters
- Industrial dust collectors
- Compressed air filters
- Gas scrubbers
- Fume extractors
- Activated carbon gas filters
- Cleanroom air filters
- Baghouse filters
- Examples
- Camfil air filters
- AAF Flanders HEPA filters
- Donaldson industrial filtration systems
- Parker Hannifin compressed air filters
Codes often confused with 8421.39
Common mistake. This is a residual category, so it's often confused with more specific gas filters like 842131 (engine air filters) or 842132 (exhaust filters) if the specific application is overlooked.
Top exporters and importers of HS code 842139, 2025
In 2025, the largest exporter of HS code 842139 in UN Comtrade data was Germany, with 17% of world exports; the largest importer in UN Comtrade data was the United States, with 13% of world imports. Countries that did not report 2025 data are estimated from partner records, which can understate them.
Top exporters 2025 · share of world exports
- 1 Germany $3.8B 17% of world exports
- 2 China $3.6B 17% of world exports
- 3 United States $2.2B 10% of world exports
World total: $21.6B Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 United States $2.8B 13% of world imports
- 2 Germany $1.7B 8.1% of world imports
- 3 United Kingdom $1.0B 5.1% of world imports
World total: $20.4B Reported figures on UN Comtrade ↗
How these figures are built
109 countries reported 2025 trade to UN Comtrade in HS 2022, and their own totals are used. Countries that did not report are estimated from what other countries recorded trading with them. Those estimates miss trade with other non-reporting countries, so they can be low, and a non-reporting country can rank higher than shown or be missing from the list. World totals add both and leave out trade between two non-reporting countries. Figures are in current US dollars; reported imports are mostly valued CIF and exports FOB, and exports include re-exports. The UN Comtrade links show the underlying records; they can also list a few reporters left out here (regional groups and older HS editions).
Source: UN Comtrade (United Nations Statistics Division), 2025 annual data.
Brazil NCM codes for 8421.39 3
Brazil splits HS 8421.39 into 3 NCM codes, Mercosur's 8-digit tariff lines.
- 8421.39.10 Electrostatic filters for gasesFiltros eletrostáticos
- 8421.39.30 Oxygen concentrators, 6 l/min or lessConcentradores de oxigênio por depuração do ar, com capacidade de saída inferior ou igual a 6 l/min
- 8421.39.90 Other gas filtering or purifying machineryOutros
All Brazil NCM codes in heading 84.21 →
Source: Siscomex NCM table, updated Oct 2026. The Portuguese text is official; the English is our translation.
Questions about HS 8421.39
What is HS code 842139?
HS code 842139 is a 6-digit subheading in the Harmonized System that covers: Machinery; for filtering or purifying gases, other than intake air filters, catalytic converters or particulate filters for internal combustion engines. This HS code is a broad residual category for machinery used in filtering or purifying gases, excluding intake air filters, catalytic converters, or particulate filters for internal combustion engines. This encompasses a vast array of industrial, commercial, and medical gas filtration systems. Products under this code are essential for maintaining air quality in manufacturing facilities, cleanrooms, hospitals, and HVAC systems, as well as for purifying process gases in various industries. Importers include industrial plants, HVAC contractors, medical facilities, and specialized equipment distributors. Exporters are typically countries with strong industrial manufacturing bases and expertise in environmental control technologies, reflecting the diverse applications and critical importance of clean air and gas in modern society.
What products fall under HS code 842139?
HEPA filters, industrial dust collectors, compressed air filters, gas scrubbers, fume extractors, activated carbon gas filters, cleanroom air filters, baghouse filters
What are common misclassifications for HS code 842139?
This is a residual category, so it's often confused with more specific gas filters like 842131 (engine air filters) or 842132 (exhaust filters) if the specific application is overlooked.
Which countries are the top exporters of goods under HS code 842139?
In 2025, the top exporters of HS code 842139 in UN Comtrade data were Germany ($3.8B, 17% of world exports), China ($3.6B) and the United States ($2.2B). World exports came to about $21.6B, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.
Which countries are the top importers of goods under HS code 842139?
In 2025, the top importers of HS code 842139 in UN Comtrade data were the United States ($2.8B, 13% of world imports), Germany ($1.7B) and the United Kingdom ($1.0B). World imports came to about $20.4B, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.
How is HS code 842139 structured?
HS code 842139 is a 6-digit subheading under the Harmonized System. The first 2 digits (84) identify the chapter, digits 3-4 (21) identify the heading, and digits 5-6 (39) specify the subheading. This code is standardized globally by the World Customs Organization.
What is the Brazil NCM code for HS code 842139?
Brazil splits HS code 842139 into 3 NCM codes: 8421.39.10 (Electrostatic filters for gases), 8421.39.30 (Oxygen concentrators, 6 l/min or less), 8421.39.90 (Other gas filtering or purifying machinery). The first 6 digits of each match the HS code.