The natural roof ventilation is a ventilation building that is perpendicular to the ridge and parallel to the mountain wall and installed on the slope. The slope natural roof ventilation can be installed across the ridge, which is more convenient for waterproofing. It can also be installed on a half-span roof. Compared with the ridge ventilator, the size is generally smaller. 

The natural roof ventilation which the throats size is above 1.5m use steel welded frames, and there is also a type of slope natural vent with smaller throats. The frame is made of hot-dip galvanized steel sheet. Because of its small size, no welding base is needed. The frame is directly fixed on the purlin, the installation is more convenient. 

Multiple parallel installations of small smoke ventilation system along the slope can make indoor ventilation and lighting more balanced. It is suitable for the renovation of factories or other old factories with low requirements for ventilation. Common industries include logistics and warehousing, automobiles, parts processing, and light. Industrial and electronic plants.

Small slope natural roof ventilation refers to a type of ventilation building with a small installation opening and installed on the roof downhill. The throat size does not exceed 1200mm, the frame is sheet-shaped, and it is directly fixed on the purlin, and multiple rows are arranged side by side on the roof, so that the interior is naturally ventilated and lighted and more balanced. It can also be installed across the ridge, which is a common type of ventilation air building.