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Ventilation pipe is a metal or composite pipe used in ventilation and air conditioning engineering. It is the infrastructure to make the air flow and reduce the concentration of harmful gases. The panel, profile and other main finished materials used in the production and installation of the air duct inside the ventilation duct shall comply with the current national design and relevant product standards, and apply for the factory inspection certificate. When entering the site, the materials shall be accepted according to the current national standards.

一個(gè)好的送風(fēng)系統(tǒng)設(shè)計(jì)，應(yīng)該使系統(tǒng)的初始投資和運(yùn)行成本能夠降低。通過遵循以下管道設(shè)計(jì)的一般準(zhǔn)則，仍然可以在系統(tǒng)的初始投資和運(yùn)行成本之間實(shí)現(xiàn)合理的平衡。

A good design of air supply system should reduce the initial investment and operation cost of the system. By following the following general guidelines for piping design, a reasonable balance can still be achieved between the initial investment and operating costs of the system.

1、風(fēng)管應(yīng)盡可能呈直線布置

1. The air duct should be arranged in a straight line as far as possible

風(fēng)管系統(tǒng)采用直線布置，運(yùn)行能耗和初期投資很低。從成本分析的角度來看，直管的成本遠(yuǎn)遠(yuǎn)低于各種彎頭和其他管件。因此，在布置風(fēng)管系統(tǒng)的平面走向時(shí)，應(yīng)盡量減少轉(zhuǎn)彎次數(shù)。過于復(fù)雜的系統(tǒng)，經(jīng)常需要定期維護(hù)，維護(hù)程序復(fù)雜且昂貴。所以一個(gè)好的控制系統(tǒng)應(yīng)該盡可能簡單可靠，易于維護(hù)或者不需要定期維護(hù)。控制系統(tǒng)的設(shè)計(jì)應(yīng)盡可能考慮將來的修改和擴(kuò)展。

The air duct system is arranged in a straight line with low energy consumption and initial investment. From the perspective of cost analysis, the cost of straight pipe is far lower than that of various elbows and other pipe fittings. Therefore, in the layout of the plane direction of the air duct system, the number of turns should be reduced as much as possible. Too complex system, often need regular maintenance, maintenance procedures are complex and expensive. So a good control system should be as simple and reliable as possible, easy to maintain or do not need regular maintenance. The design of control system should consider the future modification and expansion as far as possible.
                          

2、標(biāo)準(zhǔn)長度的直管段用于盡量減少各種異徑管和接頭的數(shù)量

2. Standard length straight pipe sections are used to minimize the number of various reducers and joints

標(biāo)準(zhǔn)長度的直管由于加工成本低，建造成本相對較低。從技術(shù)上講，任何非標(biāo)準(zhǔn)長度的矩形風(fēng)管都可以用作附件，因?yàn)樗鼈儾荒苡脴?biāo)準(zhǔn)線圈制成。

Due to the low processing cost, the construction cost of standard length straight pipe is relatively low. Technically, any rectangular duct of non-standard length can be used as an accessory because they cannot be made of standard coils.

3、建議采用螺旋圓形風(fēng)管

3. Spiral circular duct is recommended

圓形風(fēng)管允許更高的風(fēng)速。矩形風(fēng)管的允許風(fēng)速一般較低。采用圓形風(fēng)管和較高的送風(fēng)速度將大大節(jié)省投資。與類似的矩形風(fēng)管系統(tǒng)相比，圓形風(fēng)管系統(tǒng)可節(jié)省30%的鋼板。螺旋風(fēng)管的制造自動(dòng)化程度高，生產(chǎn)速度快。螺旋風(fēng)管的成本低于矩形風(fēng)管，因?yàn)殄冧\帶鋼作為原材料的價(jià)格低于整個(gè)鍍鋅鋼板，加上工廠生產(chǎn)和規(guī)格的標(biāo)準(zhǔn)化。另外，由于其支、吊架所需工作量少，安裝工作量少，所以總成本較低。

Circular duct allows higher wind speed. The allowable wind speed of rectangular duct is generally low. The use of round duct and higher air supply speed will greatly save investment. Compared with the similar rectangular duct system, the circular duct system can save 30% steel plate. Spiral duct has high degree of automation and high production speed. The cost of spiral duct is lower than that of rectangular duct, because the price of galvanized steel strip as raw material is lower than that of the whole galvanized steel sheet, plus the standardization of factory production and specifications. In addition, the total cost is low due to the less workload of support and hanger and installation.