The material requirements in the air duct manufacturing process are very particular. When the air duct surface layer is made of aluminum foil, in order to ensure that the surface layer is not easy to be damaged, the aluminum foil material and thickness are specified, and the aluminum foil thickness of the air duct surface layer composed of aluminum foil and reinforcement material is also specified.

Secondly, sheet steel flange Ventilation duct One of the basic conditions for ensuring composite materials is that the inner and outer layers are firmly bonded to the internal thermal insulation materials. Plate defects exceeding a certain area not only affect the service life of the air duct, but also sometimes reduce its insulation effect. Therefore, the defect shall not be greater than 6 ‰ to achieve the normal use of materials in the system.

At present, non-metallic air duct materials have developed rapidly with many varieties. Due to their characteristics and advantages, their applications are becoming more and more extensive. In order to ensure the safety in use, it is required that the air ducts made of these materials should have non combustible or fire-retardant B1 combustion performance according to the needs of the project, and the surface layer must be non combustible materials. According to the engineering application practice and product status in China for many years, the low value of peel strength test and aluminum foil thickness value of heat sensitive tape and pressure sensitive tape are specified; It is required that the tape width should not be less than 50mm to prevent the tape used from failing to meet the strength of pipe wall sealing and the service life of air duct. The advantage of thermosensitive adhesive tape is to rely on hot-melt bonding. As long as it is not heated, the adhesive surface is solidified at room temperature, and has a solid bonding strength.

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