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HSChapter 84
U.S. imports of filtering or purifying machinery and apparatus for gases (nesoi) (HS 842139) totaled $249.5M in April 2026, traded with 76 countries.
Importers of Filtering or Purifying Machinery and Apparatus for Gases (NESOI) paid $20.3M in duties in April 2026 — an effective duty rate of 11% on $181.3M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: April 2026 dataSpanning industrial dust collectors, electrostatic precipitators, gas separation equipment, and high-pressure pneumatic fluid power filters, this residual gas-filtration heading serves sectors ranging from semiconductor fabrication to power generation and metalworking. The US schedule breaks the heading into seven distinct 10-digit lines — including dust collection for machine tools (8421390105), electrostatic precipitators (8421390120), and gas separation equipment (8421390140) — making precise product description on entry documents essential. Mexico and Germany lead US imports, with China also a notable source subject to Section 301 tariff considerations.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
Gas separation equipment separates a gas mixture into its component streams — for example, nitrogen-oxygen separation or natural gas processing — while industrial gas cleaning equipment removes contaminants (dust, particulates, aerosols) from a single gas stream. The operating principle and output (separated gas fractions vs. cleaned single-stream gas) are the key classification criteria.
The US schedule at 8421390160 covers pneumatic fluid power filters rated at or above 550 kPa. Filters below that threshold, or those not specifically designed for pneumatic fluid power systems, would fall under the general NESOI line 8421390190. Manufacturer pressure ratings and system design documentation should be retained to support the classification.
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Monthly import values over time
| Country | Imports | Exports | Balance |
|---|---|---|---|
| CANADA | $33.2M | $47.7M | +$14.5M |
| MEXICO | $28.7M | $31.9M | +$3.1M |
| GERMANY | $29.7M | $8.5M | -$21.2M |
| KOREA, SOUTH | $26.4M | $5.0M | -$21.4M |
| CHINA | $23.2M | $7.2M | -$16.0M |
HS10 import codes under this HS6 parent. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Duty Collected |
|---|---|---|---|---|
| 8421390115 | DUST COLLECTION AND AIR PURIFICATION EQUIP, NESOI | $123.5M | 11.63% | $10.9M |
| 8421390190 | FILTERING OR PURIFYING MACH & APPARATUS,GAS, NESOI | $65.6M | 11.91% | $5.8M |
| 8421390140 | GAS SEPARATION EQUIPMENT | $31.8M | 6.31% | $874K |
| 8421390130 | INDUSTRIAL GAS CLEANING EQUIPMENT, NESOI | $23.3M | 10.45% | $2.2M |
| 8421390105 | DUST COLLECT AND AIR PURIFI EQUIP FOR MACH TOOLS | $4.3M | 14.68% | $463K |
| 8421390160 | PNEUMATIC FLUID POWER FILTERS RATED GT/= 550 KPA | $659K | 10.26% | $66K |
| 8421390120 | ELECTROSTATIC PRECIPITATORS, IND GAS CLEAN EQUIP | $230K | 10.00% | $23K |
DUST COLLECTION AND AIR PURIFICATION EQUIP, NESOI
FILTERING OR PURIFYING MACH & APPARATUS,GAS, NESOI
GAS SEPARATION EQUIPMENT
INDUSTRIAL GAS CLEANING EQUIPMENT, NESOI
DUST COLLECT AND AIR PURIFI EQUIP FOR MACH TOOLS
PNEUMATIC FLUID POWER FILTERS RATED GT/= 550 KPA
ELECTROSTATIC PRECIPITATORS, IND GAS CLEAN EQUIP
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 8421390190 | FILTERING OR PURIFYING MACH & APPARATUS,GAS, NESOI | $92.9M |
| 8421390115 | DUST COLLECTION AND AIR PURIFICATION EQUIP, NESOI | $54.2M |
| 8421390140 | GAS SEPARATION EQUIPMENT | $26.9M |
| 8421390130 | INDUSTRIAL GAS CLEANING EQUIPMENT, NESOI | $13.5M |
| 8421390105 | DUST COLLECT AND AIR PURIFI EQUIP FOR MACH TOOLS | $6.9M |
| 8421390120 | ELECTROSTATIC PRECIPITATORS, IND GAS CLEAN EQUIP | $529K |
| 8421390160 | PNEUMATIC FLUID POWER FILTERS RATED GT/= 550 KPA | $342K |
FILTERING OR PURIFYING MACH & APPARATUS,GAS, NESOI
1.5M kg
DUST COLLECTION AND AIR PURIFICATION EQUIP, NESOI
1.1M kg
GAS SEPARATION EQUIPMENT
8.6K no
INDUSTRIAL GAS CLEANING EQUIPMENT, NESOI
5.2K no
DUST COLLECT AND AIR PURIFI EQUIP FOR MACH TOOLS
201.8K kg
ELECTROSTATIC PRECIPITATORS, IND GAS CLEAN EQUIP
14.9K no
PNEUMATIC FLUID POWER FILTERS RATED GT/= 550 KPA
3.1K no
TURBOJET AND TURBOPROLLER PARTS
HS 841191
| State | Imports | Exports | Balance |
|---|---|---|---|
| California | $46.0M | $29.0M | -$17.0M |
| Texas | $39.6M | $16.0M | -$23.6M |
| Illinois | $6.9M | $12.4M | +$5.4M |
| Port | Imports | Exports | Balance |
|---|---|---|---|
| LOS ANGELES, CA | $41.0M | -- | -$41.0M |
| NORFOLK-NEWPORT NEWS, VA | $18.4M | $7.4M | -$10.9M |
| HOUSTON, TX | $15.7M | $8.4M | -$7.3M |