The height of the exit should be more than two meters, and the smoke outlet should be located on the ceiling of the smoke-proof partition wall or on the wall near the ceiling, and the horizontal distance from the farthest point of the smoke-proof partition wall should not exceed 30 meters. The exit should be closed with a corrosion-resistant isolation net. Filter smoke particles with plug cloning device to avoid harmful gases directly discharged into the atmosphere.

The smoke outlet is an opening that is automatically or manually opened, usually closed on the wall or ceiling of a building, and can be automatically or manually opened when necessary to eliminate the hot gas and smoke generated by the fire. Its main function is to reduce the temperature of hot air at the fire site, prevent the fire from spreading, and prevent the victims from dying due to excessive smoke and lack of oxygen at the fire site.