# United States tariff lines under HS 8421.39

> 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.

Source: https://border.bot/countries/united-states/hs-codes/842139
Last updated: 9 October 2026

[Countries](https://border.bot/countries) / [United States](https://border.bot/countries/united-states) / [Chapter 84](https://border.bot/countries/united-states/hs-codes/84) / [8421.39](https://border.bot/countries/united-states/hs-codes/842139)

## Key facts

- HS subheading: [8421.39](https://border.bot/hs-codes/842139)
- Duty (MFN): Free
- National lines: 7
- Tariff: [United States](https://border.bot/countries/united-states)
- Chapter: 84: Nuclear reactors, boilers, machinery and mechanical appliances; parts thereof

## United States lines under 8421.39

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.

- [8421.39.01.05](https://border.bot/countries/united-states/hs-codes/8421390105) Filtering or purifying machinery and apparatus for gases, Other, Dust collection and air purification equipment, For machine tools of headings 8456 through 8465, inclusive. Duty (MFN): free
- [8421.39.01.15](https://border.bot/countries/united-states/hs-codes/8421390115) Filtering or purifying machinery and apparatus for gases, Other, Dust collection and air purification equipment, Other. Duty (MFN): free
- [8421.39.01.20](https://border.bot/countries/united-states/hs-codes/8421390120) Filtering or purifying machinery and apparatus for gases, Other, Other, Industrial gas cleaning equipment, Electrostatic precipitators. Duty (MFN): free
- [8421.39.01.30](https://border.bot/countries/united-states/hs-codes/8421390130) Filtering or purifying machinery and apparatus for gases, Other, Other, Industrial gas cleaning equipment, Other. Duty (MFN): free
- [8421.39.01.40](https://border.bot/countries/united-states/hs-codes/8421390140) Filtering or purifying machinery and apparatus for gases, Other, Other, Gas separation equipment. Duty (MFN): free
- [8421.39.01.60](https://border.bot/countries/united-states/hs-codes/8421390160) Filtering or purifying machinery and apparatus for gases, Other, Other, Other, Pneumatic fluid power filters, rated at 550 kPa or greater. Duty (MFN): free
- [8421.39.01.90](https://border.bot/countries/united-states/hs-codes/8421390190) Filtering or purifying machinery and apparatus for gases, Other, Other, Other, Other. Duty (MFN): free

## In other countries

No other national tariff on border.bot has live lines under 8421.39 yet.

- [The Harmonized System text for 8421.39](https://border.bot/hs-codes/842139)

- Previous subheading: [8421.32](https://border.bot/countries/united-states/hs-codes/842132) Centrifuges, including centrifugal dryers; filtering or purifying machinery and apparatus, for liquids or gases; parts thereof
- Next subheading: [8421.91](https://border.bot/countries/united-states/hs-codes/842191) Of centrifuges, including centrifugal dryers

## Frequently asked questions

### How many national tariff lines does the United States tariff have under HS 8421.39?

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.

### What is the duty on HS 8421.39 in the United States?

Every United States line under 8421.39 is free of general (MFN) duty.

## Sources and updates

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.

Official source files:

- https://hts.usitc.gov/reststop/exportList?from=0000000000&to=9999999999&format=CSV&styles=false

Machine-readable: https://border.bot/countries/united-states/hs-codes/842139.json