Because of the characteristics of simple structure, convenient construction and reasonable cost, the roof louver vent has been widely used in steel structure factories, especially metallurgical factories. In view of the fact that metallurgical plants are generally high-temperature and high-heat workshops. The high-temperature and high-heat workshops of metallurgical plants in these areas generally tend to choose natural roof ventilation.

For metallurgical industrial plants that need to adjust natural ventilation, roof louver vent with adjustable window sashes and horizontal windshields should be used. There is a considerable distance between the lower edge of the windshield and the roof of natural ventilation system, which can easily clear the snow and dust on the roof.

In metallurgical plants, horizontal windshields are installed in order to reduce the air intrusion caused by the holes on the lower edge of the windshield of the air tower. Under the effect of wind pressure, when the residual pressure at the bottom of the natural vent in the metallurgical workshop is not large, the horizontal windshield can increase the exhaust air volume of the roof gas building.