The galvanized spiral duct is mainly plated with zinc on the iron sheet of the wind pipe to protect the iron sheet. Zinc coating is passivated, dyed or coated with light retaining agent, which can significantly improve its protective and decorative properties. The spiral duct market is generally divided into three types according to the material: galvanized spiral duct, stainless steel spiral duct and composite spiral duct. Among them, the stainless steel air duct has the best quality and applicability, but the price is high. At present, the most widely circulated spiral pipes in the market are galvanized sheets.

鍍鋅板螺旋風管，基本是不銹鋼螺旋風管的特性，但是相對只有不銹鋼風管的三分之二甚更低。復合螺旋風管一般應用在外界環境較為普通，對風管要求不太高的場所。螺旋風管適用范圍非常廣泛。凈化系統送回風管、空調通風管、工業送排風通風管、系統吸排風管、礦用抽放瓦斯管、礦用涂膠布風筒等。

Galvanized sheet spiral ducts are basically stainless steel spiral ducts, but the price is only two-thirds or even lower than stainless steel ducts. Composite spiral air duct is commonly used in places where the external environment is more common and the requirements for wind pipes are not too high. The spiral duct is widely applied. Purification system return air duct, central air conditioning ventilation duct, industrial air supply and exhaust ventilation duct, environmental protection system suction and exhaust duct, mine gas drainage pipe, mine coating duct, etc.

有效的風管的清洗方式有三種：

There are three ways to clean the most effective wind pipes.

1.真空吸污：用類似有手握式的真空吸污管來操作。用刷子直接接觸管道內壁以污物。這種方法需要風管有較大的檢修孔使操作的人員能夠盡可能夠得到但這種方法可能漏掉一局部塵土和污物，因為風管不能形成完全的負壓條件。而以下幾種方法可以形成負壓條件。

1. vacuum suction: operated by a vacuum suction pipe similar to a handheld type. Use brush to directly contact the inner wall of the pipe to remove dirt. This method requires the duct to have a large overhaul hole so that the operator can get as much as possible, but this method is most likely to leave out a part of the dust and dirt, because the duct can not form a complete negative pressure conditions. The following methods can form negative pressure conditions.

2.動力洗刷：用氣動或者電動的毛刷將臟污刷動，然后污物用和氣體沖洗相同的方法和方向被吸到真空收集器中。這種方法要求盡可能的小心不于破壞保溫資料的外表。

2. Power scrubbing: brush dirt with a pneumatic or electric brush, and then the dirt is sucked into the vacuum collector in the same way and direction as the gas scrubbing. This method requires caution as far as possible, so as not to damage the appearance of thermal insulation materials.

3.氣體沖洗：這種方法借助連接到風管的配有噴嘴的軟管以輸送壓縮空氣。設計噴嘴使得壓縮空氣能夠把塵土和污物驅趕進來。而被壓縮空氣去干的污物和塵土則順著風管被輸送到真空集容器中。

3. gas flushing: this method uses the hose connected to the air duct with nozzle to transport compressed air. The design of the nozzles allows compressed air to drive dust and dirt into it. The dirt and dust dried by compressed air are transported to the vacuum collection container along the duct.

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