The OPTIMISER 10 Fan Specification App, from supplier of high-performance axial-flow fans Multi-Wing America (Burton, OH), is a resource for original equipment engineers to specify the most-efficient, tailor-made Multi-Wing fan for their application. The app is suitable for specifying fans in several applications, including engine cooling in off-highway equipment and power generators. It features an intuitive user interface, advanced natural-frequency sound calculations and visual display of total efficiency on the fan performance curves. OPTIMISER 10 also offers blade-profile previews with available diameter ranges, materials and rotations. For more information, visit www.multi-wing.net/.