螺旋风管主要在风管铁皮上镶上一层锌，对铁皮起到维护的功效。锌涂层经钝化处理、染色或涂敷护光剂后，能明显提高其防护力和装饰性。螺旋风管市场中按材料一般分为三类：镀锌螺旋风管、不锈钢螺旋风管及其复合螺旋风管。其中，不锈钢风管品质好，适用性强，但高。
The spiral air duct is mainly coated with a layer of zinc on the iron sheet of the air duct, which plays a maintenance role on the iron sheet. After passivation, dyeing, or application of protective agents, zinc coatings can significantly improve their protective and decorative properties. The spiral duct market is generally divided into three categories based on materials: galvanized spiral duct, stainless steel spiral duct, and composite spiral duct. Among them, stainless steel air ducts have good quality and strong applicability, but their prices are high.
目前市面通广的螺旋风管是镀锌板的。镀锌板螺旋风管，基本是不锈钢螺旋风管的特点，但是相对只有不锈钢风管的三分之二甚更低。复合螺旋风管一般运用在外界环境比较一般，对风管规定不太高的场所。螺旋风管适用范围十分广泛。净化设备送到风管、空调通风管、工业送排风通风管、系统吸排风管、矿井抽放瓦斯管、矿井涂胶带风筒等。
Currently, the widely circulated spiral air ducts on the market are made of galvanized sheet steel. Galvanized sheet spiral air duct is basically the characteristic of stainless steel spiral air duct, but its price is relatively only two-thirds or even lower than that of stainless steel air duct. Composite spiral air ducts are generally used in places where the external environment is relatively ordinary and the regulations for air ducts are not too high. Spiral air ducts have a wide range of applications. Purification equipment is sent to air ducts, central air conditioning ventilation ducts, industrial supply and exhaust ventilation ducts, environmental protection system suction and exhaust ducts, mine gas drainage ducts, mine tape coated air ducts, etc.
有效的风管清洗方法有三种：
There are three effective methods for cleaning air ducts:
1.真空吸污：用类似有手握式的真空吸污管来操作。用刷子接触管路内壁以污物。这类方法必须风管有较大的检修口使操控的人员可以尽量够获得但这种方法可能漏掉一部分尘土和污物，由于风管不能产生完全的负压标准。而以下这些方法能够产生负压标准。
1. Vacuum suction: Use a handheld vacuum suction tube to operate. Touch the inner wall of the pipeline with a brush to remove dirt. This type of method requires the air duct to have a large access hole so that operators can access it as much as possible. However, this method may miss out on some dust and dirt, as the air duct cannot produce a complete negative pressure standard. And the following methods can generate negative pressure standards.
2.动力刷洗：用气动或者电动的刷子将污迹刷动，随后污物用和气体清洗同样的方法和方向被吸进真空收集器中。这类方法规定尽可能当心不会破坏保温材料的外表。
2. Power brushing: Use a pneumatic or electric brush to brush the dirt, and then the dirt is sucked into the vacuum collector using the same method and direction as gas cleaning. This type of method requires maximum caution not to damage the appearance of the insulation material.
3.气体清洗：这类方法依靠连接到风管的配有喷头的软管以运输空气压缩。设计喷头促使空气压缩能够把尘土和污物驱逐进来。而被空气压缩去干的污物和尘土则沿着风管被输送到真空集容器里。
3. Gas cleaning: This type of method relies on a hose equipped with a nozzle connected to the air duct to transport air compression. Design a nozzle to compress the air and expel dust and dirt. The dirt and dust compressed and dried by air are transported along the air duct to the vacuum collection container.
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