Spiral duct As the iron sheet is prone to chemical reaction in various environments, corrosion and rust will occur. However, zinc hardly changes in dry air. In humid air, dense basic zinc carbonate film will be formed on the surface of zinc. The spiral air duct is mainly coated with 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 protecting agent.

Spiral air duct has the following characteristics:

1. The appearance is smooth, free of zinc nodules and burrs, and silver white;

2. Easy installation and few connection points;

3. Low ventilation resistance and noise;

4. Good strength and rigidity;

5. No hydrogen embrittlement and temperature hazard, which can ensure the mechanical properties of materials unchanged;

6. It can replace some processes requiring hot galvanizing;

7. Good corrosion resistance, neutral salt spray test up to 240 hours;

8. It is completed by hot galvanizing method, and is suitable for various strong acid, alkali fog and other corrosive environments;

9. Various specifications of air ducts can be specially designed and customized according to customer requirements.