The PowerPlus range of fans from Elta Fans is covered in a 20-page colour brochure. These 2-stage contra-rotating axial fans as shown in the brochure comprise four standard sizes (450, 500, 560 and 630 mm) and can have their speed controlled with a duty of up to 3.92 m3/s. The brochure includes specifications, technical and dimensional data, wiring diagrams and accessories, and case studies of the use of these fans in restaurant kitchens. They can also be used to supply fresh air to offices.