{
  "summary": "The United States tariff splits HS 8421.39 (filtering or purifying machinery and apparatus for gases: Other) into 7 national lines: 8421.39.01.05 (for machine tools of headings 8456 through 8465, inclusive), 8421.39.01.15 (other), 8421.39.01.20 (electrostatic precipitators), 8421.39.01.30 (other) and 3 others. Every United States line under 8421.39 is free of general (MFN) duty.",
  "updatedAt": "2026-10-09",
  "facts": [
    {
      "label": "HS subheading",
      "value": "8421.39",
      "source": null,
      "url": "https://border.bot/hs-codes/842139"
    },
    {
      "label": "Duty (MFN)",
      "value": "Free",
      "source": "https://hts.usitc.gov/reststop/exportList?from=0000000000&to=9999999999&format=CSV&styles=false"
    },
    {
      "label": "National lines",
      "value": "7",
      "source": null
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    {
      "label": "Chapter",
      "value": "84: Nuclear reactors, boilers, machinery and mechanical appliances; parts thereof",
      "source": null
    }
  ],
  "faq": [
    {
      "question": "How many national tariff lines does the United States tariff have under HS 8421.39?",
      "answer": "The United States tariff splits HS 8421.39 (filtering or purifying machinery and apparatus for gases: Other) into 7 national lines: 8421.39.01.05 (for machine tools of headings 8456 through 8465, inclusive), 8421.39.01.15 (other), 8421.39.01.20 (electrostatic precipitators), 8421.39.01.30 (other) and 3 others."
    },
    {
      "question": "What is the duty on HS 8421.39 in the United States?",
      "answer": "Every United States line under 8421.39 is free of general (MFN) duty."
    }
  ],
  "sections": [
    {
      "id": "covers",
      "title": "United States lines under 8421.39",
      "text": [
        "The United States tariff splits HS 8421.39 (filtering or purifying machinery and apparatus for gases: Other) into 7 national lines: 8421.39.01.05 (for machine tools of headings 8456 through 8465, inclusive), 8421.39.01.15 (other), 8421.39.01.20 (electrostatic precipitators), 8421.39.01.30 (other) and 3 others.",
        "Every United States line under 8421.39 is free of general (MFN) duty."
      ]
    },
    {
      "id": "other-countries",
      "title": "In other countries",
      "text": [
        "No other national tariff on border.bot has live lines under 8421.39 yet."
      ]
    },
    {
      "id": "sources",
      "title": "Sources and updates",
      "text": [
        "The tariff lines for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026.",
        "The duty rates for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026.",
        "The trade programmes for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026.",
        "This page was last updated on 9 October 2026.",
        "Guidance from published tariff data, not a binding ruling. For a decision customs must follow, apply to the destination’s customs authority for a binding tariff ruling."
      ]
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      "code": "84",
      "description": "Nuclear reactors, boilers, machinery and mechanical appliances; parts thereof"
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      "code": "8421",
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      "code": "842139",
      "description": "Filtering or purifying machinery and apparatus for gases: Other"
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        "description": "For machine tools of headings 8456 through 8465, inclusive",
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          "Other",
          "Other",
          "Other"
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      "code": "842132",
      "description": "Centrifuges, including centrifugal dryers; filtering or purifying machinery and apparatus, for liquids or gases; parts thereof",
      "indexable": false
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      "code": "842191",
      "description": "Of centrifuges, including centrifugal dryers",
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