HTS code 9902.15.38 covers "Economizers comprising auxiliary plant for use with boilers of heading 8402, with a pressure capacity of 10686.87 kPa, certified by the importer as for use in the pulp and paper industry (provided for in subheading 8404.10.00)" under the US Harmonized Tariff Schedule. This is the official duty rate charged by US Customs when this product is imported into the United States, sourced directly from the U.S. International Trade Commission and refreshed daily.