来源：http://ccjsjlm.com 日期：2019-11-07 发布人：admin
With the development of society, many families use their own windows to smoke in the kitchen, resulting in cooking downstairs and smoking upstairs. So when the family decorates, the kitchen chimney decorates appears very important, once appears unreasonable, will form the counter taste phenomenon, forms the influence to the family life.
1) ventilation pipe
Non combustible materials shall be selected for the manufacturing of ventilation pipe body, structure, fixed data, sealing data and flexible joint. When there is fuel in the ceiling, the ventilation pipe in the ceiling shall be insulated with non combustible materials and kept at a distance of not less than 150 mm from the fuel.
2) positive pressure air supply pipe
The gas supply pipeline shall be made of non incineration materials. When selecting metal air duct, the wind speed of the pipeline should not be greater than 20 m / s. When selecting the air duct of non-metallic materials such as concrete with smooth inner surface, it shall not be more than 15m / s.
When the pressurized air supply pipe passes through the area where fire may occur, the fire resistance limit of the air supply shaft shall not be less than 1h. The air supply shaft shall be separated from the adjacent parts, and the fire resistance limit shall not be less than LH.
Ventilation and air conditioning
The ventilation and air conditioning system shall be made of incombustible materials.
The air duct and flexible joint of Shandong ventilation pipe contacting corrosive medium can be made of refractory. The coverage data of composite data air duct must be non combustible data, and the insulation data of Shandong air duct must be non combustible or non combustible Class B1, which is harmless to human body.
What are the requirements for the manufacture and installation of ventilation pipes?
1) the diameter or length of air duct horizontal device shall be less than 400mm, and the distance shall not be greater than 4m; when it is greater than or equal to 400mm, the distance shall not be less than 3m;
2) gas pipe straightening device, the distance shall not be more than 4m, but the fixed parts of each riser shall not be less than 2.
2. The joint of rectangular air duct of mechanical smoke control system shall be bitten and sealed.
3. The unit area of air supply duct shall be allowed to leak according to the provisions of GB50243 standard for construction quality inspection of ventilation and air conditioning engineering. The allowable air leakage of the air supply pipeline shall be determined according to the working pressure; the ventilation pipeline shall conform to the rules of the medium pressure system.