Common daylighting skylights include rectangular skylights, serrated skylights, flat skylights, triangular skylights, horizontal sunken skylights, etc. Ventilation skylight includes rectangular ventilation skylight, vertical or horizontal sunken skylight, well skylight and so on. Rectangular skylight, suitable for north and south, arranged along the longitudinal direction of the factory building, with simple structure. Flat skylight is a skylight formed by directly opening a lighting hole on the roof of a factory building and installing transparent materials such as flat glass or glass fiber reinforced plastic cover on the lighting hole. The roof load is not increased, the structure is simple, the layout is flexible and the cost is low. However, the flat skylight is not conducive to ventilation, and because the window sash is arranged horizontally, it is more susceptible to dust pollution than the rectangular skylight, so it is generally suitable for cold working workshops. Rectangular ventilation skylight is formed by adding wind shields on both sides of rectangular skylight, which is mostly used in dry and hot processing workshops. In order to improve the ventilation efficiency, there is generally no skylight fan, and only a wind deflector is installed at the air inlet. Sunken skylight has the advantages of flexible layout, good ventilation and even lighting. The thermal processing workshop is arranged on one side or both sides, which requires lighting and ventilation, and the workshop with less dust and waste heat is arranged in the middle.