When the evacuation length is set between two exits, the evacuation length should not be greater than 40m, and when the bag walkway is set, the evacuation length should not be greater than 20m.

Fire escape is a life passage connecting life and death. To put out the fire quickly, we must "concentrate our forces quickly and accurately" to stop the fire from spreading in the first place. The important feature of fire is rapid expansion and spread. According to the experimental statistics, when the fire burns violently, the horizontal spread speed of smoke is 0.5-0.8m/s, and the vertical spread speed along the stairwell or shaft pipeline can reach 3-4m/s. ..