Product classification
HS code for Industrial air purifier: 8421.39
Machinery, for filtering or purifying gases, other than intake air filters, catalytic converters or particulate filters for internal combustion engines.
Classification of industrial air purifier under HS 8421.39
Industrial air purifiers are classified under HS code 842139. This code covers machinery and apparatus for filtering or purifying gases, excluding specific categories like intake filters for internal combustion engines. The classification is driven by the mechanical function of the device—removing pollutants, dust, or chemical vapors from the air in an industrial setting. Chapter 84 encompasses mechanical appliances, and the 8421 heading specifically addresses centrifuges and filtering machinery. Sub-heading 842139 is a residual category for gas filtering equipment that does not fall under more specific sub-headings like 842131 (intake filters) or 842132 (catalytic converters). These industrial units often employ various technologies, including HEPA filters, activated carbon, or electrostatic precipitation, to ensure air quality in manufacturing plants or laboratories. The classification is based on the "essential character" of the machine as a gas purifier. It is distinct from liquid filters (842121-842129) and from simple fans that do not have a purification component (8414). Accurate classification under 842139 requires documentation of the filtration efficiency and the intended industrial application, as this distinguishes the product from consumer-grade air cleaners. Furthermore, the scale and capacity of the unit often dictate its classification as industrial machinery rather than a domestic appliance. If the unit is designed for permanent installation in a factory duct system, 842139 is the most appropriate code.
- Covers
- Industrial air scrubbers
- HEPA filtration systems for cleanrooms
- Gas phase extractors for chemical plants
- Industrial fume extractors
- Electrostatic precipitators for gas purification
- Also under 8421.39
- 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 product is frequently confused with 842131, which is strictly for intake air filters for internal combustion engines. It is also sometimes misclassified under 850980, which covers domestic electromechanical appliances with self-contained electric motors, though industrial-grade purifiers should remain in 842139.
Top exporters and importers of HS 842139 (the code used for industrial air purifier), 2025
In 2025, the largest exporter of HS 842139 (the code used for industrial air purifier) 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.
Figures cover everything classified under HS 842139, not only industrial air purifier.
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 industrial air purifier
Brazil splits HS 8421.39 into 3 NCM codes. Pick the one that matches your product:
- 8421.39.10Electrostatic filters for gases
- 8421.39.30Oxygen concentrators, 6 l/min or less
- 8421.39.90Other gas filtering or purifying machinery
Source: Siscomex NCM table, updated Oct 2026. The Portuguese text on each NCM page is the official one.
Questions about industrial air purifier
What is the HS code for Industrial air purifier?
The HS code for Industrial air purifier is 842139 (Machinery; for filtering or purifying gases, other than intake air filters, catalytic converters or particulate filters for internal combustion engines). The HS code for industrial gas filtering and purifying machinery is 842139.
How do I classify Industrial air purifier for customs?
Industrial air purifier is classified under HS code 842139 — Machinery; for filtering or purifying gases, other than intake air filters, catalytic converters or particulate filters for internal combustion engines. This is a 6-digit subheading level code.
Are replacement filters classified here?
No, replacement filter elements are usually classified under 842199 as parts of filtering machinery, or under their constituent material (e.g., Chapter 59 for textile filters).
Which countries are the top exporters of industrial air purifier (HS 842139)?
In 2025, the top exporters of HS 842139 (the code used for industrial air purifier) 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 industrial air purifier (HS 842139)?
In 2025, the top importers of HS 842139 (the code used for industrial air purifier) 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.
Is the HS code for Industrial air purifier the same in all countries?
The base HS code 842139 for Industrial air purifier is internationally standardized for the first 6 digits across 200+ countries. Individual countries may add additional digits for national tariff lines and specific classifications.
What is the NCM code for industrial air purifier in Brazil?
Brazil splits HS 842139 into 3 NCM codes, so the right one for industrial air purifier depends on the product's details: 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).