，风管应尽可能按直线布置。
First of all, the wind pipe should be arranged in line as far as possible.
这一条要求对任何风管系统的布置都是重要的准则。直线布置的风管系统，在运行能耗和初投资两方面都是低的。从的观点分析，空气总是"希望"走直线，这将减少能耗。从费用的观点分析，直管段的费用比各种弯头等管件要少很多。所以，当布置一个风管系统的平面走向时，应力图将拐弯的数员减少。
This requirement is the most important criterion for any duct system layout. The linear layout of the duct system is the lowest in terms of operation energy consumption and initial investment in two aspects. From the point of view of energy conservation, air always "wants" to take a straight line, which will reduce energy consumption. From the point of view of cost, the cost of straight section is much less than that of fittings such as various elbows. Therefore, when the plane direction of an air duct system is arranged, the number of turns should be minimized.
其次，采用标准长度的直线管段，将各种变径管和接头的数量减少。直的、标准长度的风管造价相对便宜，因为它们的加工费低，标准长度的直风管，可按标准宽度的钢板卷材在白动生产线上制作。而任何段非标准长度的矩形风管，从技术上说，都可当作配件，因为它们不可能用标准卷材做成。螺旋圆形风管实际上可做成任意长度。椭圆形风管的标准长度则完全取决于金属加工厂的加工标准。有的设计者总是认为，在一个风管系统平面设计中，频繁地减小风管断面尺寸，似乎就可以减少一次投资。其实不然。
Secondly, the standard length straight pipe section is used to minimize the number of various diameter pipes and joints. Straight, standard length wind pipes are relatively cheap because their processing costs are low and the standard length of the straight wind pipe can be made on the white moving production line according to the standard width of the steel sheet. Any section of the non standard length rectangular duct can be used technically as an accessory, because they can not be made of standard coil material. The spiral air duct can actually be made at any length. The standard length of the elliptical duct depends entirely on the processing standard of the metalworking plant. Some designers always think that in a plane design of windpipe system, reducing the size of the duct section frequently seems to reduce one investment. In fact, it is not.
第三，只要安装空间范围允许，就建议采用螺旋圆风管。
Third, as long as the installation space scope is allowed, we recommend the use of spiral air duct.
圆形风管允许采用较高的风速。仁义通风介绍一个中型变风量空调系统，其风速可达20m/s，而一个大型变风量宁调系统，其风速则可高达30m/S。对矩形风管的允许风速则一般都较低，风速过高容易引起扁平风管壁的共振而产生噪声，特别是会产生低频噪声并传室内。
The circular wind pipe allows for higher wind speed. Ren Yi ventilation introduces a medium VAV air conditioning system with a wind speed of 20m/s. A large VAV system can be as high as 30m/S. The allowable wind speed for the rectangular duct is generally low, and the high wind speed can easily cause the resonance of the flat wind tube wall to produce noise, especially the low frequency noise will be produced and spread to the room.
采用圆形风管和较高的送风速度，将可显著地节省投资。，与类似的矩形风管系统相比，圆形风管系统将可节省15%一30%的薄钢板。例如，同样输送17000m3/h的空气，根据控制噪声的要求，圆形风管的风速可取19m/s，矩形风管则取10m/s，它们的钢板消耗量比较可见表5-1。从表中可知，采用圆形风管，可节约37％的薄钢板。
The use of a circular duct and a higher air supply speed will significantly save investment. First, compared with a similar rectangular duct system, the round air duct system will save 15% or 30% of the thin steel plate. For example, the same air for transporting 17000m3/h, according to the requirement of controlling noise, the wind speed of the circular pipe is 19m/s, and the rectangle wind pipe is 10m/s, and the consumption of the steel plate is compared to the visible Table 5-1. From the table, we can see that using round air pipe can save 37% of thin steel plate.
后，圆形风管的安装费用低于矩形风管。这是因为，圆形风管本身结构的刚性好，预制管段可以较长，现场安装的工作量相对较少。圆形风管的制作、连接都较矩形风管严密，漏风率大约为1%，而矩形风管的漏风率有时高达l0%，甚更高，为防止空气渗漏，需要花去大量人力对每一矩形风管进行检漏和密封。
Finally, the installation cost of the circular duct is lower than that of the rectangular duct. This is because the rigid structure of the circular duct itself is good, the precast pipe section can be longer, and the workload of on-site installation is relatively small. The circular wind pipe is made and connected more closely than the rectangular wind pipe, the air leakage rate is about 1%, and the leakage rate of the rectangular duct is sometimes as high as l0%, even higher. In order to prevent air leakage, it is necessary to spend a lot of manpower to leak and seal each rectangular duct.
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