The current standards of flue are as follows:
1. Article 6.8.2 of the Code for Residential Design requires that the exhaust duct product itself is a set exhaust duct product that can prevent the backflow of each floor. Article 6.8.2 of Code for Residential Design (GB596-211) also specifies that the exhaust duct product itself must have backflow prevention structure.
2. The building industry standard Exhaust Duct for Kitchen and Bathroom (JG/T194-26) promulgated by the Ministry of Construction is applicable to exhaust flue made of various raw materials (except sulphoaluminate cement and portland cement, raw materials must obtain relevant new material application certificates).
3. The building materials industry standard "Glass Fiber Reinforced Cement Exhaust Pipe" (JC/T854-28) promulgated by the National Development and Reform Commission is applicable to the residential exhaust flue made of sulphoaluminate cement and silicate cement with alkali-resistant glass fiber mesh. Sulfoaluminate cement and portland cement are the raw materials of exhaust port with stable performance.
4. Article 7.2.9 of the national standard Code for Fire Protection Design of Buildings (GB516-26) stipulates that vertical pipe wells such as smoke exhaust, exhaust and garbage passage should be set independently, and their shaft walls should be incombustible with a fire resistance limit of not less than 1.h h..
5. Article 9.4.3 of the National Standard Code for Residential Buildings (GB 5368-25) stipulates that the installation of vertical shafts in residential buildings should meet the following requirements: cable shafts, pipeline shafts, smoke exhaust ducts, exhaust ducts, etc. should be set independently, and the shaft wall should be made of incombustible components with a fire resistance limit of not less than 1.h h..
6. according to the national standard "experimental method for fire resistance of ventilation pipes GB/T17428-29", the fire resistance limit needs to reach more than 1.h ..
flue pipe is a tubular device for discharging waste gas and smoke. Residential flue refers to a vertical pipe product used to remove kitchen smoke or toilet waste gas, also known as exhaust duct, ventilation duct and residential exhaust duct.
In the past, most flues were prefabricated by sulphoaluminate cement with alkali-resistant glass fiber mesh or ordinary portland cement with steel wire mesh and other reinforcing materials.
when the flue gas at the air inlet is discharged into the flue, it will meet the flue gas discharged upward from the lower floor. When the two air streams meet, it will form a vortex and an air curtain, which will hinder the upward movement of the flue gas at the lower floor. Once the fire check valve is stuck by oil pollution and fails to open, the flue gas will string smoke indoors because of the upward movement.