U.S. imports of Filtering or Purifying Machinery and Apparatus for Gases (NESOI) (HS 842139) totaled $283.1M in August 2026, imported from 88 countries.
Importers of Filtering or Purifying Machinery and Apparatus for Gases (NESOI) paid $26.7M in duties in August 2026, an average duty rate of 9.87% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Filtering or Purifying Machinery and Apparatus for Gases (NESOI) imports of $283.1M in August 2026 ran 13% above the year-to-date monthly average of $249.8M.
Last updated: August 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.
13.2K import shipments a month
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.
Subheading 2 of 12 in heading 8421
Subheading 842139 · $283.1M of $1.4B
ImportsExports
Imports
$283.1MYoY · free account
Exports
$210.7MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $2.8B of Filtering or Purifying Machinery and Apparatus for Gases (NESOI) and exported $2.3B.
Through August 2026. Source: U.S. Census Bureau.
Imports · August 2026
origin
China pays 25.7% duty; Canada 0.4%.
customs district
destination
entry
rate provision · imports
22.9% enters free of duty; duty collected equals 9.87% of imports for consumption.
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Imports for consumption | Average duty rate | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 8421390115 | Dust Collection and Air Purification Equip, NESOI | $147.5M | 10.08% | 75.09% | $14.9M |
| 8421390190 | Filtering or Purifying Mach & Apparatus, Gas, NESOI | $68.6M | 8.78% | 66.03% | $6.0M |
| 8421390130 | Industrial Gas Cleaning Equipment, NESOI | $24.5M | 10.55% | 89.01% | $2.6M |
| 8421390140 | Gas Separation Equipment | $25.1M | 9.84% | 74.51% | $2.5M |
| 8421390105 | Dust Collect and Air Purifi Equip for Mach Tools | $4.1M | 16.43% | 75.89% | $672K |
| 8421390160 | Pneumatic Fluid Power Filters Rated Gt/= 550 Kpa | $842K | 9.50% | 59.36% | $80K |
| 8421390120 | Electrostatic Precipitators, Ind Gas Clean Equip | $327K | 11.89% | 100.00% | $39K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
Import lines come from the U.S. Harmonized Tariff Schedule and export lines from Schedule B. The two are numbered by different agencies, so the same 10-digit code can appear in both tables describing a different product.
Trade Directory
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