Smoke control system is a system used to control smoke and harmful gas emissions during building fires. This system is widely used in high-rise buildings, underground garages, shopping malls and other places and is also mandatory. However, some people don't know why they need a smoke control system.

1. Reasons for setting the smoke control and exhaust system

1, personnel evacuation safety: in the event of a fire, smoke is one of the most dangerous factors. Smoke can lead to reduced visibility, making it difficult for people to navigate and increasing the difficulty of escape. The smoke control and exhaust system can expel smoke from the building, keep the passageway open, and help people evacuate quickly and safely.

(2) Provide escape routes: In case of fire, the stairs and corridors inside the building may be blocked by smoke, making it impossible for people to pass through. Smoke control and exhaust systems can remove smoke and ensure the availability of escape routes so that people can successfully evacuate the building.

3, reduce the speed of fire spread: the speed of fire spread is crucial to the safety of personnel. The smoke control and exhaust system can control the spread of smoke, slow the development of the fire, give personnel more escape time, and also help reduce the damage of the fire to the building.

4, protect property and environment: smoke and harmful gases caused by fire are not only harmful to human health, but also cause damage to buildings and the surrounding environment. The smoke control and exhaust system can discharge smoke and harmful gases in time, reducing the impact of fire on property and the surrounding environment.

As a part of the smoke control system, the fire resistance of the smoke control duct is also very important. According to the specifications of the "Technical Standard for Building Smoke Control and Exhaust System", there are different fire limit requirements for smoke control and exhaust air pipes set in different parts, ranging from 30 minutes, 60 minutes, 90 minutes, and the interior of the air pipe is smooth and made of non-combustible materials. However, it is not clear in what form the smoke exhaust duct reaches the fire resistance limit.

At present, most of the galvanized steel sheet metal air ducts on the market are used as smoke control air ducts. However, galvanized steel duct is not up to the fire resistance limit requirements, so it will use the practice of metal duct cladding to meet the fire resistance limit requirements.

The air duct cladding method refers to adding a layer of fireproof material to the wind pipe and other facilities for wrapping to improve its fire performance. Usually used fireproof materials are glass wool, rock wool, fire board and so on.

In addition to the fireproof package scheme of the air duct, there are prefabricated fireproof composite air ducts, which meet the corresponding fire resistance limit requirements and can be used directly, which is very convenient.