The smoke absorption system of the corridor is to ensure time for people to evacuate from the incident area, and help the fire brigade and rescue workers to quickly approach the incident. Not only the apartment but the factory also need this system to ensure labor safety for workers and the production of the factory.

According to QCVN 06-2010, if a building height of more than 28m is required, the smoke extraction system must be designed for corridor and lobby areas. If there are stairs for L1 type exits, .

The smoke exhaust system must be noted for the smoke in the corridor ceiling, the roof smoke exhaust system will start when the fire alarm system from the fire system..Stair pressure regulator: This system is a pressurized fan system with fan boosters are usually installed in the roof of the building, will start when the fire alarm from the fire system blows. In the stairwell to pressure in the elevator chamber is to prevent the smoke from the corridor or other areas to asphyxiate the person. According to this QC, the pressure in the elevator is not less than 20pa and no more than 20pa for the type N2.