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Spiral air duct is a thin-walled pipe made of metal strip coils with spiral seams. It is circular and has the main characteristics of no welding, no air leakage, and no water leakage. It is mainly used for air supply and bulk material transportation, replacing traditional white iron pipes (i.e. manual seam iron pipes). It is a type of air duct that does not require manual tapping.

其主要用途如下：

Its main uses are as follows:

(1) 送風，包括通氣，如送鮮風和排氣，這個范圍很廣，如工廠車間，生產場地空氣，由于有害氣體產生需要排出室外，又需要把室外空氣輸送至室內。

(1) Air supply, including ventilation, such as fresh air supply and exhaust, covers a wide range of areas, such as factory workshops and production site air. Due to the generation of harmful gases, outdoor air needs to be discharged and transported indoors.

(2) 送冷風。常見的是空調的管道，這種管道需要加保溫材料。

(2) Supply cold air. The common type is the pipes of central air conditioning, which require insulation materials.

(3) 排油煙。飯店、酒樓、賓館的廚房均有大量油煙產生，需要排出，使用圓形的風管就是油煙囪。

(3) Exhaust fumes. Restaurants, restaurants, and hotel kitchens all produce a large amount of oil smoke that needs to be discharged. The use of circular air ducts is called oil smoke chimneys.

(4) 除塵。有些工廠生產車間很多塵埃，需要專門的除塵裝置，其中風流量較大的管道，可使用螺旋風管。

(4) Dust removal. Some factories have a lot of dust in their production workshops and require specialized dust removal devices. For pipes with high air flow, spiral air ducts can be used.

(5) 散裝物料輸送。有些工廠的生產過程中，需要輸送松散的顆粒，非常是比重不大的如發泡塑料粒之類的使用螺旋風管造價低、效果好。

(5) Bulk material transportation. In the production process of some factories, it is necessary to transport loose particles, especially for those with small specific gravity such as foam plastic particles, which use spiral air ducts with low cost and good results.

蘇州通風管道：

Suzhou ventilation pipeline:

1、設計獨特：通風管道的開口上安裝了煙氣止回閥和防火隔離門，可以有效防止串味和串火。

1. Unique design: The opening of the ventilation duct is equipped with a smoke check valve and a fire isolation door, which can effectively prevent odor and fire.

2、造價低：通風管道與傳統磚砌通風道比，能節約工程造價40%左右。

2. Low cost: Compared to traditional brick ventilation ducts, ventilation ducts can save about 40% of the project cost.

3、設計靈活：通風管道加工可根據預留洞的大小，隨時調整管道的規格尺寸。

3. Flexible design: The processing of ventilation ducts can adjust the specifications and dimensions of the ducts at any time according to the size of the reserved holes.

4、質高強：與傳統磚砌通風道比，菱鎂通風道自重輕、強度高，能大幅度降低建筑物的承受荷載

4. High quality and strength: Compared with traditional brick ventilation ducts, magnesite ventilation ducts have a light weight and high strength, which can significantly reduce the load-bearing capacity of buildings

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