The country has a clear requirement that high-rise buildings must be installed to prevent smoke exhaust system.

 The specification requirements and standards of smoke prevention and exhaust system, the national "High-rise Civil Building Design fire protection Code" specifies that the following parts of the first and second high-rise buildings should be equipped with smoke exhaust facilities:

 (1) An inner walkway with a length of more than 20 meters;

 (2) the area of more than 100 square meters, and often stay or "combustible room";

 (3) The atrium of high-rise buildings and the basement with frequent stays or more combustible materials.

 The role of smoke control system: once the smoke fire in the building can effectively control the smoke in the delineated smoke control area, do not let it spread to other areas, reduce the large area of damage in the building, can reduce the difficulty of rescue disaster relief.

 Function of smoke exhaust system: once the building smoke fire can be quickly started, the smoke discharged from the building in time, so that evacuees, disaster relief personnel are not trapped by fireworks, reduce casualties and property losses.  Create favorable conditions for saving people and fighting fires.