通风管道可以让建筑物室内保持空气流通，排放有害气体，而在通风管道加工设计过程中，涉及的考虑事项有很多，下面来讲讲通风管道材料以及截面形状的选择内容吧。
Ventilation ducts can keep the air in the building and discharge harmful gases. There are many considerations involved in the processing and design of ventilation ducts. Let's talk about the selection of ventilation duct materials and section shapes.
通风管道材料的选择：
Selection of ventilation duct materials:
通风管道加工主要由钢板、金属软管、塑料和橡胶软管、纤维板、胶合板、石膏板、聚氯乙烯塑料板、砖和混凝土等制成。钢板是通风管道常用的材料，具有耐腐蚀、耐高温的特点，便于制造和安装。
Ventilation pipe processing is mainly made of steel plate, metal hose, plastic and rubber hose, fiberboard, plywood, gypsum board, PVC plastic board, brick and concrete. Steel plate is a commonly used material for ventilation pipes, which has the characteristics of corrosion resistance and high temperature resistance, and is convenient for manufacturing and installation.
一些通风管道在技术上需要经常移动，这需要柔性材料，如金属软管、塑料软管和橡胶软管。硬质聚氯乙烯塑料板表面光滑，加工方便，但不耐高温，适用于腐蚀性工业通风和排气系统。砖和混凝土制成的通风管主要适用于与建筑物连接，阻力小，经久耐用。总之，通风管道的材料应根据应用条件综合选择。
Some ventilation ducts technically need to be moved frequently, which requires flexible materials, such as metal hoses, plastic hoses and rubber hoses. The surface of rigid PVC plastic plate is smooth and easy to process, but it is not resistant to high temperature. It is suitable for corrosive industrial ventilation and exhaust systems. The ventilation pipe made of brick and concrete is mainly suitable for connecting with buildings, with small resistance and durability. In a word, the material of ventilation duct shall be comprehensively selected according to the application conditions.
风管加工时的截面形状一般分为矩形和圆形。在相同横截面积的情况下，圆形通风管道不仅阻力小，而且强度高，节省了管道。对于圆形通风管道，直径越小，制造越容易，保温越方便。
The cross-section shape of air duct is generally divided into rectangle and circle. In the case of the same cross-sectional area, the circular ventilation duct not only has small resistance, but also has high strength, which saves the pipe. For circular ventilation ducts, the smaller the diameter, the easier it is to manufacture and the more convenient it is to keep heat.
但是，矩形通风管道的管件比圆形通风管道的管件容易制作，布局也比圆形通风管道简单。在正常情况下，当通风管的横截面较小，管内流速较高时，宜采用圆形通风管。
However, the pipe fittings of rectangular ventilation duct are easier to make than those of circular ventilation duct, and the layout is also simpler than that of circular ventilation duct. Under normal circumstances, when the cross section of the ventilation pipe is small and the flow rate in the pipe is high, the circular ventilation pipe should be used.
山东通风管道加工人员认为通风管道截面较大时，应采用矩形通风管道，并能充分利用建筑空间。对于矩形通风管道，宽高比越接近1越好，这样不仅可以节省运行功率，还可以节省投资。
Shandong ventilation duct processors believe that rectangular ventilation ducts should be used when the cross-section of ventilation ducts is large, and the building space should be fully utilized. For rectangular ventilation ducts, the closer the width height ratio is to 1, the better. This can not only save operating power, but also save investment.
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