Mechanical smoke exhaust system can effectively eliminate a large number of personnel, to ensure the safety of personnel in the event of fire. The following small weave from the mechanical smoke exhaust mode, smoke exhaust system layout, smoke exhaust mode and other aspects of smoke prevention and exhaust design, I hope to help you.

　　一、机械排烟

　　I. Mechanical smoke exhaust

　　1. 局部排烟:每个空间区域设置风机，将室外烟气抽走。

　　1. Local smoke exhaust: Each space area is equipped with a fan to remove outdoor smoke.

　　2. 集中排烟:利用排烟风机，通过管道收集和排出多个区域的烟气。

　　2. Centralized smoke exhaust: using smoke exhaust fan, collecting and discharging smoke from multiple areas through pipelines.

　　二是机械排烟部件

　　Second, mechanical smoke exhaust components

　　1. 没有直接自然通风但长度超过20米的人行道或直接自然通风但长度超过60米的人行道。

　　1. Pedestrians with no direct natural ventilation but over 20 meters in length or those with direct natural ventilation but over 60 meters in length.

　　2. 没有窗户的房间，面积超过100，有大量的居住者或火炉。

　　2. A room without windows, covering an area of more than 100 square meters, has a large number of residents or stoves.

　　3.除了可用的窗户和水井外，200以上或50以上的高可燃性、经常有人居住的房间或地下室，没有自然排烟条件，也没有净空超过12米的中庭。

　　3. Apart from the windows and wells available, there are no natural smoke exhaust conditions and no atrium with a clearance of more than 12 meters in highly flammable rooms or basements, which are more than 200 square meters or over 50 square meters.

　　1. 内走道机械排烟系统。内走道通常垂直布置。

　　1. Mechanical smoke exhaust system in Inner aisle. The inner aisle is usually arranged vertically.

　　2. 多室机械排烟系统。通常采用水平排列。

　　2. Multi-room mechanical smoke exhaust system. Usually it is arranged horizontally.

　　4. 烟气排放计算

　　4. Flue gas emission calculation

　　1. 风机进行隔烟时，每小风量不低于60立方米，单台风机小风量不低于7200m3/h。

　　1. When the fan is used for smoke isolation, the minimum air volume per square metre is less than 60 cubic metres, and the minimum air volume per fan is less than 7200 m3/h.

　　2. 当风机进行2个以上分区时，大排烟量为60000m3/h，按不小于120立方米/计算。

　　2. When the fan is divided into more than two zones, the maximum smoke exhaust capacity is 60,000 m3/h, calculated at no less than 120 cubic meters/square meters.