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HSChapter 84
U.S. imports of filtering or purifying machinery and apparatus for gases (nesoi) (HS 842139) totaled $270.4M in July 2026, traded with 87 countries.
Importers of Filtering or Purifying Machinery and Apparatus for Gases (NESOI) paid $21.7M in duties in July 2026 — an effective duty rate of 12% on $179.5M in dutiable value, based on actual customs collections rather than the published tariff schedule. Filtering or Purifying Machinery and Apparatus for Gases (NESOI) imports of $270.4M in July 2026 ran 10% above the year-to-date monthly average of $245.0M.
Last updated: July 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.
12.8K shipments/mo
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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HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 8421390115 | Dust Collection and Air Purification Equip, NESOI | $136.8M | 8.18% | 66.98% | $11.2M |
| 8421390190 | Filtering or Purifying Mach & Apparatus,Gas, NESOI | $67.1M | 7.22% | 58.83% | $4.8M |
| 8421390140 | Gas Separation Equipment | $36.5M | 7.86% | 66.24% | $2.9M |
| 8421390130 | Industrial Gas Cleaning Equipment, NESOI | $23.6M | 9.16% | 82.14% | $2.2M |
| 8421390105 | Dust Collect and Air Purifi Equip for Mach Tools | $5.7M | 9.98% | 74.99% | $564K |
| 8421390160 | Pneumatic Fluid Power Filters Rated Gt/= 550 Kpa | $588K | 15.70% | 91.55% | $92K |
| 8421390120 | Electrostatic Precipitators, Ind Gas Clean Equip | $22K | 35.00% | 100.00% | $8K |
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.
ImportsExports
Imports
$270.4MYoY · Pro
Exports
$202.4MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.
Imports · July 2026
origin
customs district
destination
entry
rate provision · imports
30.4% enters free of duty; the effective duty rate is 8.04%.