U.S. Customs and Border Protection · CROSS Database · 1 HTS code referenced
Primary HTS Code
8421.39.0010
$217.5M monthly imports
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Ruling Age
35 years
Data compiled from CBP CROSS Rulings, Census Bureau Trade Data · As of 2026-04-30 · Updates monthly
The tariff classification of a membrane air dryer fromJapan.
NY 861384 MAR 25 1991 CLA-2-84:S:N:N1:105 861384 CATEGORY: Classification TARIFF NO.: 8421.39.0010 Mr. George Avetisian Imex, Inc. 4040 Del Rey Avenue, Unit 9 Marina del Rey, CA 90292 RE: The tariff classification of a membrane air dryer from Japan. Dear Mr. Avetisian: In your letter dated March 14, 1991 you requested a tariff classification ruling. The SUNSEP-W Membrane Air Dryer uses fluoro-organic chemistry and ion exchange membrane technology to remove water vapor from atmospheric or industrial air. Because of its relatively small output volume this air dryer finds principal application in dehumidifying gas for analytical equipment, instrument air and compressed air. The applicable subheading for the SUNSEP-W Membrane Air Dryer will be 8421.39.0010, Harmonized Tariff Schedule of the United States (HTS), which provides for other filtering or purifying machinery and apparatus for gases. The rate of duty will be 3.9 percent ad valorem. This ruling is being issued under the provisions of Section 177 of the Customs Regulations (19 C.F.R. 177). A copy of this ruling letter should be attached to the entry documents filed at the time this merchandise is imported. If the documents have been filed without a copy, this ruling should be brought to the attention of the Customs officer handling the transaction. Sincerely, Jean F. Maguire Area Director New York Seaport