Description: This article discusses a product from LONGWELL Fan Factory that offers customization for forward ducted fans in various sizes. The focus is on the high-quality square volute fan provided by the supplier. The product descriptions, relevant qualifications/licenses, and additional modules are all highlighted. The article emphasizes the customized options available for fans and the quality assurance provided by LONGWELL. Overall, it centers on the features and specifications of the forward ducted fans and square volute fans offered by the factory.