With the passage of time, people's requirements for ventilation duct cleaning and the saving of equipment and materials are also gradually improving; With the progress of technology, people's requirements for the quality of HVAC engineering have also increased. Many existing stainless steel air ducts and spiral round air ducts are used to meet the functional requirements of ventilation, air conditioning and dust removal transportation.

这就需要在现有技术上不断进步，在设备规划、开发和制造方面采用更节约材料、更健康和更可持续的发展战略。目前用于空调通风工程的金属风道主要有圆形风道和不锈钢风道。圆形风管强度高，耗材少，但加工工艺较乱，占用空间大;不锈钢风道，便于布置和加工，应用广泛。也有机械生产的，螺旋形由钢带绕制而成，有圆形、长方形，为了节省空间，许多不锈钢风管用平圆制成。

This requires continuous progress in existing technology and the adoption of more material-saving, healthier and more sustainable development strategies in equipment planning, development and manufacturing. At present, the metal air ducts used in air conditioning and ventilation projects mainly include circular air ducts and stainless steel air ducts. The circular air duct has high strength and less consumables, but the processing technology is messy and takes up a lot of space; Stainless steel air duct, easy to arrange and process, is widely used. There are also mechanical ones. The spiral shape is made of steel strip. There are circular and rectangular shapes. In order to save space, many stainless steel air ducts are made of flat circles.

通风管道的制造和加工，特别是对于一些小型企业，手工车间式企业，这样的企业不会长久生存下去。因为我们认为，一个企业的发展离不开其企业文化和战略的发展。虽然主风道仍为铁板，但由于环保、使用寿命、防潮、隔音、承重等原因，在施工和保护方面存在很多缺陷。这导致了市场对新产品的需求来改善这一问题。新型不锈钢风管的出现正好适应了商场的需求。经过多次工程应用和实践，逐渐被投资者所接受。

The manufacturing and processing of ventilation pipes, especially for some small enterprises, manual workshop enterprises, such enterprises will not survive for a long time. Because we believe that the development of an enterprise is inseparable from the development of its corporate culture and brand strategy. Although the main air duct is still made of iron plate, there are many defects in construction and protection due to environmental protection, service life, moisture-proof, sound insulation, load-bearing and other reasons. This leads to the market demand for new products to improve this problem. The emergence of new stainless steel air ducts just meets the needs of shopping malls. After many engineering applications and practices, it is gradually accepted by investors.

商场风管一般分为三类:镀锌不锈钢风管、不锈钢不锈钢风管和复合不锈钢风管。同时，不锈钢风管质量好，适用性强，但价格昂贵。目前商场中使用较为广泛的不锈钢风管是镀锌钢板风管。镀锌不锈钢风管基本上是不锈钢风管的特点，但其价格却比不锈钢风管低三分之二甚至更低。复合不锈钢风道一般用于外部环境比较一般，对风道要求不太高的地方。由于铁片是简单的，在各种环境中发生化学反应，导致腐蚀和生锈。然而，锌在干燥的空气中几乎不会发生变化。在潮湿的空气中，锌的表面会形成良好的碱性碳酸锌膜。不锈钢风筒主要是在风筒的铁片上镀一层锌，以保护铁片。镀锌层经钝化、染色或涂覆光保护剂后，其保护和装饰性能均有明显改善。

Air ducts in shopping malls are generally divided into three categories: galvanized stainless steel air ducts, stainless steel air ducts and composite stainless steel air ducts. At the same time, the stainless steel air duct has good quality and strong applicability, but it is expensive. At present, galvanized steel air ducts are widely used in shopping malls. Galvanized stainless steel air duct is basically the feature of stainless steel air duct, but its price is two-thirds lower or even lower than that of stainless steel air duct. Composite stainless steel air duct is generally used in places where the external environment is relatively general and the requirements for air duct are not too high. Because the iron sheet is simple, chemical reactions occur in various environments, resulting in corrosion and rust. However, zinc hardly changes in dry air. In humid air, a good alkaline zinc carbonate film will be formed on the surface of zinc. Stainless steel air duct is mainly coated with zinc on the iron sheet of the air duct to protect the iron sheet. After passivation, dyeing or coating with light protective agent, the protective and decorative properties of zinc coating are significantly improved.

通风管道耐久性差。氯化镁和氧化镁的摩尔比是有科学依据的。氯化镁的含量应根据氧化镁中活性镁含量的测定来确定。然而，不合格产品的生产厂家不知道氧化镁活性镁含量的测定，更不用说合理的摩尔比值。只知道氧化镁和盐水，凝固成风管。风道余氯离子含量大，在湿空气环境中容易返卤水，软化系数低，使用寿命短。

The durability of ventilation duct is poor. The molar ratio of magnesium chloride to magnesium oxide has scientific basis. The content of magnesium chloride should be determined according to the determination of active magnesium content in magnesium oxide. However, the manufacturers of unqualified products do not know the determination of magnesium oxide active magnesium content, let alone a reasonable molar ratio. Only magnesium oxide and salt water are known to solidify into air ducts. The residual chloride ion content in the air duct is large, and it is easy to return brine in the wet air environment, with low softening coefficient and short service life.