Axial fan can continuously more than 0.5hours in 280°C gas fume. The series of fans have been tested by the ”National Fire Equipment Quality Supervision and Test Centre”. Mainly used in ventilation and fire-fighting smoke evacuation in engineering. Working Temperature: Work continuously more than 0.5hours in 280°C gas fume. Applications: Mainly used for ventilation and fire fighting exhaust systems at special places of engineering buildings. (Such as explosion-proof or anti-corrosion environment)