Folder CNW Fiberglass Centrifugal Fans. Folder DHK Fiberglass. Folder Equipment AutoCad Drawings. The following drawings are in AutoCAD 'dwg' format as 'zip'files, and provided as a courtesy to consulting engineers with the application of our equipment. Dimensions are subject to change. The American Fan Company range of centrifugal fans consists of fans for general air movement, emergency smoke extraction, and in the United Kingdom, ATEX explosive atmospheres.