* WT35-11 Type Axial Roof Fan has flow rate large and lower pressure than Centrifugal Fan, DTW-I Type Axial Roof Fan could be designed to be revolving in two directions and reversible according to needs of users. It has features like low noise, light weight steady revolution, high efficiency, good anti-corrosion performance and so on, which is suitable for ventilation for mechanical workshops such as petroleum，chemical industry, spinning and weaving as well as warehouse buildings.