Project CategoryMain project classification
1. This chapter applies to the inspection and acceptance of the processing, production quality of metal, non-metallic ducts and composite ducts or ducts used in construction engineering ventilation and air conditioning projects. 2. The acceptance of the production quality of the air duct shall be carried out separately according to its material, system type and place of use, mainly including the material, specifications, strength, tightness of the air duct and the quality of the finished product. 3. The acceptance of the production quality of the air duct shall be implemented in accordance with the design drawings and the provisions of this code. The purchased air duct used in the project must also provide the corresponding product qualification certificate or verify the strength and tightness before it can be used. 4. For the inspection and acceptance of ventilation duct specifications, the air duct shall be based on the outer diameter or length of the outer side, and the air duct shall be based on the inner diameter or length of the inner side. The specifications of the ventilation ducts should be in accordance with the regulations in Tables 4.1.4-1 and 4.1.4-2. Circular ducts should be given priority to the basic series. The irregular elliptical duct refers to the rectangular duct, and is based on the length of the long side of the plane and the short diameter.