防烟加压送风系统和机械排烟系统设计是高层建筑防火设计的一个重要部分。从国内外多次高层建筑火灾的统计中发现，烟气和毒气的作用是火灾中引起死亡的重要因素之一。特别是在现代化的高层建筑中，由于装饰材料、家俱等设施较多，化纤地毯、塑料贴面等可燃物质一但着火，在燃 Smoke and air supply system and mechanical smoke exhaust system design is an important part of high-rise building fire design. From the statistics of many high-rise building fires at home and abroad, it is found that the effect of flue gas and poison gas is one of the important factors that cause death in fire. Especially in the modern high-rise buildings, due to decoration materials, furniture and other facilities more, chemical fiber carpets, plastic veneer and other combustible material, but a fire, burning