Spiral duct: The duct is mainly used to connect the air circulation between the two places and play the role of ventilation. The most widely used on the market is the spiral air duct (fabric air duct and galvanized sheet tinplate material). Types of spiral air ducts Spiral air ducts are generally divided into three categories according to their materials: galvanized spiral air ducts, fabric air duct spiral air ducts and composite spiral air ducts. Among them, the fabric air duct has better quality and strong applicability, but the price is high. The most widely circulated spiral duct on the market is galvanized sheet. Galvanized sheet spiral air duct is basically the characteristic of fabric air duct spiral air duct, but the price is only two-thirds or even lower than that of fabric air duct. Composite spiral air ducts are generally used in places where the external environment is relatively common and the requirements for air ducts are not too high. Spiral duct features: Because the iron sheet is prone to chemical reactions in various environments, causing corrosion and rust. Zinc, on the other hand, hardly changes in dry air. In humid air, a dense basic zinc carbonate film is formed on the zinc surface. The spiral air duct is mainly coated with a layer of zinc on the iron sheet of the air duct to protect the iron sheet. The protective and decorative properties of zinc coating can be significantly improved after passivation treatment, dyeing or coating with light protectant. The spiral air duct has the following characteristics: 1. The appearance is smooth, without zinc bumps and burrs, and it is silvery white; 2. It is easy to install and has few connection points; 3. The ventilation resistance is small and the ventilation noise is small; 4. Both strength and rigidity are good; 5 , The thickness is controllable and can be arbitrarily selected within 5-107μm; 6. No hydrogen embrittlement, no temperature hazard, which can ensure the mechanical properties of the material remain unchanged; 7. It can replace some processes that require hot-dip galvanizing; 8. Corrosion resistance Good performance, neutral salt spray test up to 240 hours; 9. Completed by hot-dip galvanizing method, suitable for various strong acid, alkali fog and other strong corrosive environments; 10. According to customer requirements, we can specially design and customize various specifications of wind Tube. Compared with the traditional white iron pipe made by hand, the mechanical spiral duct has the following advantages: (1) Good sealing. (2) Both strength and rigidity are good. (3) The ventilation resistance is small, the ventilation noise is small, and the round tube is better than the square tube. (4) Easy installation and few connection points. (5) High grade and beautiful appearance.
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