Part of the connection GD30K2-12 type axial fan can be used as pipe in the middle of the pipe, used in chemical, paper and other plants below 60 ℃ air transportation and a variety of motor harmful gases. This type of fan impeller diameter divided by its: NO.6,7,8,9,10 etc. 5 machine numbers. Blades have four, six two kinds. Blade angles can be made of 15 °, 20 °, 25 °, 30 ° and other four. Motor mounted on the upper duct with adjustable motor mount plate supporting the motor, and can adjust the center distance. All use of the V-belt drive. Bearing box fixed central duct sealing protective tube and the dielectric isolation.