Fireproof rock wool board is a kind of inorganic fiber insulation material, with excellent fire performance, so it will be used in the fire exhaust pipe to improve the fire resistance of the pipe. In addition to the fireproof rock wool board, can the smoke exhaust pipe use other materials to improve the fire resistance of the pipe?

According to the Technical standard of Building Smoke Control and exhaust system, the materials used and fire resistance limit requirements of fire smoke exhaust pipes are specified. Among them, the material used in the fire smoke exhaust pipe must be non-combustible material and the internal surface must be smooth. The fire resistance limits of fire exhaust pipes in different parts are 0.5h, 1h, 1.5h, 2h, etc., which should be designed according to actual needs.

It is thus known that the smoke exhaust pipe must be made of non-combustible materials and meet the corresponding fire resistance limit requirements, and what materials and methods are not specified.

At present, most of the metal plate air ducts on the market are used as fire exhaust pipes, which can not meet the fire resistance limit requirements. Therefore, class a non-combustible material will be used to wrap the metal air duct to enhance the fire resistance requirements of the pipeline.

However, it is not the use of class A non-combustible material to make the metal air duct meet the corresponding fire resistance limit requirements, which needs to be tested.

According to the "fire resistance test method of ventilation pipe", the fire resistance test method of fire exhaust pipe is specified, including the requirements of test equipment, test process and evaluation method. According to this standard, the smoke exhaust duct should be maintained at a high temperature environment of 800 ° C for 0.5 to 2h(testing according to the needs of the project). During the detection process, the fire exhaust duct should be able to remain intact in a high temperature environment, without deformation, cracking and other phenomena, and can effectively prevent the spread of the fire and prevent the fire from spreading to other areas.

From the above, we can know that the wrapped fire smoke exhaust pipe does not have to use fireproof rock wool, but also can use other A-class non-combustible materials, as long as the overall air pipe meets the corresponding fire resistance limit requirements. At present, the commonly used A-class non-combustible materials for wrapping fire smoke exhaust pipes are rock wool, glass wool, silicic acid board, etc. However, it should be noted that some local policies have different provisions, such as the Shanghai area prohibits the use of glass wool as a fireproof wrapping material for fire smoke exhaust ducts, and recommends the use of rock wool.