自然排烟设施不具备排烟作用，分析其原因主要有以下几个方面：
Natural smoke exhaust facilities do not have the function of smoke exhaust
百叶式自然排烟窗
Louver type natural smoke exhaust window
1、自然排烟窗的设置位置不当。 从自然排烟效果考虑，排烟窗应尽量靠近墙的上部设置，目前有相当数量的自然排烟窗不是设置在墙的上部，而是下部，距顶板、吊顶的距离较大，不利于自然排烟。
1. The setting position of natural smoke exhaust window is improper. Considering the effect of natural smoke exhaust, the smoke exhaust windows should be set as close as possible to the upper part of the wall. At present, a considerable number of natural smoke exhaust windows are not set at the upper part of the wall, but at the lower part. The distance from the roof and ceiling is large, which is not conducive to natural smoke exhaust.
2、自然排烟窗的开窗面积达不到规范要求。 国家标准《高层民用建筑设计防火规范》对采用自然排烟部位的开窗面积均有明确规定，但由于部分设计人员未按规范要求进行认真计算，或将固定窗的面积计算在排烟窗面积之内，导致部分工程排烟窗面积达不到规范要求，直接影响排烟效果。
2. The opening area of the natural smoke exhaust window can not meet the requirements of the specification. The national standard "code for fire protection design of high rise civil buildings" has clear provisions on the area of windows where natural smoke exhaust is used. However, due to the fact that some designers have not carefully calculated the area of fixed windows in accordance with the requirements of the code, or the area of fixed windows is calculated within the area of smoke exhaust windows, the area of smoke exhaust windows in some projects can not meet the requirements of the code, which directly affects the smoke exhaust effect.
3、自然排烟窗的结构形式不合理。 有的把排烟窗做成不可开启的固定窗，有的将窗的上部做成固定窗，把可开启的排烟窗设在窗的下部，严重影响排烟功能。
3. The structure of natural smoke exhaust window is unreasonable. Some of the smoke exhaust windows are made into non openable fixed windows, some of the upper part of the window is made into fixed windows, and the openable smoke exhaust windows are set in the lower part of the window, which seriously affects the smoke exhaust function.
4、安装高度较高的排烟窗缺少便于开启的操作机构。 按规范要求，排烟窗应有便于开启的装置，但有些安装高度较高，开启困难的排烟窗均未安装开启操作装置，不利火灾情况下排烟窗的开启。
4. The smoke exhaust window with high installation height is lack of easy to open operating mechanism. According to the requirements of the specification, the smoke exhaust windows should have devices that are easy to open, but some smoke exhaust windows with high installation height and difficult to open are not equipped with opening devices, which is unfavorable for the opening of smoke exhaust windows in case of fire.