US Trade Commission Finalizes Tariffs on Chinese Fiberglass Door Panels

The decision follows a March 2025 petition filed by the American Fiberglass Door Coalition, which argued that dumped and subsidized products from China were undercutting domestic industry standards. In June 2026, the U.S. Department of Commerce calculated significant dumping margins, reaching as high as 147.85%, alongside subsidy rates that peaked at 186.46% for non-cooperative firms.

Specific findings target major exporters, with Jiangxi Fangda Tech Co., Ltd. facing a 104.31% dumping rate and Dalian Capstone Engineering Co., Ltd. hit with 41.82%. Other entities, including Anhui Xinyu Fiberglass Door Co. and Wuxi Lutong Fiberglass Doors Co., will face a blanket 73.07% dumping duty. Firms that declined to cooperate with federal investigators are subject to the maximum 186.46% subsidy penalty.

Timothy C. Brightbill, co-lead counsel for the Coalition, described the result as a vital win for domestic producers and their employees. The Commerce Department is now set to formalize the orders, requiring duty deposits on all incoming Chinese fiberglass door skins and panels. These measures will remain in place for at least five years, with annual administrative reviews scheduled to adjust rates based on shifting trade conditions.