WASHINGTON — The U.S. Department of Commerce has issued a final antidumping duty order that will impose duties on uncovered mattress innerspring units from Vietnam and South Africa.

The DOC had announced final duties on the products in October, but was awaiting final word from the International Trade Commission on whether imports of the goods caused injury to the domestic innerspring producers. On Dec. 4, the ITC issued a final determination that the U.S. industry had been injured due to the sale of these units in this country at less than fair market value.

Innerspring units used in mattresses are covered by the order. It does not apply to such units used in upholstered furniture.

Imports of innerspring units from South Africa and Vietnam were valued at $3.6 million and $657,000, respectively, in 2007, according to the International Trade Administration.

As a result of the ITC's finding, the DOC will impose duties of 121.39% on units imported from South Africa and a Vietnam-wide rate of 116.31%. The rates were announced in October.

The original investigation, requested by Leggett & Platt, also covers China. In August, the DOC released preliminary duties of 118.17% for eight major Chinese producers and an all-China rate of 234.51%. However, the ITC has not officially ruled on the China aspect of the case, so final duties will be announced later.