Because galvanized iron sheet is very easy to generate exothermic reaction under various natural environments, leading to erosion and corrosion. However, zinc does not change much in dry gas. In the wet and cold gas, the zinc surface will be transformed into a high-density basic zinc carbonate film. The key of stainless steel air duct is to coat zinc on the galvanized sheet of the ventilation air duct, which has maintenance effect on the galvanized sheet. The protective and decorative properties of zinc coating can be significantly improved after passivation, dyeing or coating with light protecting agent.

螺旋风管具有以下特性：

Spiral duct has the following characteristics:

1、外观光滑，无锌瘤、毛刺，呈银白色；

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

2、安装方便，连接点少；

2. Easy installation and few connection points;

3、耐腐蚀性好，中性盐雾试验达240小时；

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

4、采用热镀锌方法完成，适用于各种强酸、碱雾气等强腐蚀环境中；

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

5、厚度均为可控，在5-107μm之内任意选择；

5. The thickness is controllable from 5-107 μ Any selection within m;

6、无氢脆、无温度危害，可保证材料力学性能不变；

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

7、可代替部分需热镀锌的工艺；

7. It can replace some processes requiring hot galvanizing;

8、通风阻力小，通风噪声小；

8. Low ventilation resistance and noise;

9、强度与刚性均好；

9. Good strength and rigidity;

10、可根据客户要求，专门设计、定做各种规格风管；

10. According to customer requirements, we can specially design and customize various specifications of air ducts;