WT35-11, FWT35-11 Type of Roll-flowing Roof Air Blower With large wind and fower pressure than Centrifugal Air Blower, DWT-1 Type of Roll-flowing Roff Air Blower 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 anticorrosion performance and so on, which is suitable in ventilation for mechanical workshops such as petroleum, chemical industry, spinning and weaving as well as warehouse buildings