通風管道可以讓建筑物室內保持空氣流通，排放有害氣體，而在通風管道加工設計過程中，涉及的考慮事項有很多，下面來講講通風管道材料以及截面形狀的選擇內容吧。
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.
通風管道材料的選擇：
Selection of ventilation duct materials:
通風管道加工主要由鋼板、金屬軟管、塑料和橡膠軟管、纖維板、膠合板、石膏板、聚氯乙烯塑料板、磚和混凝土等制成。鋼板是通風管道常用的材料，具有耐腐蝕、耐高溫的特點，便于制造和安裝。
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.
一些通風管道在技術上需要經常移動，這需要柔性材料，如金屬軟管、塑料軟管和橡膠軟管。硬質聚氯乙烯塑料板表面光滑，加工方便，但不耐高溫，適用于腐蝕性工業通風和排氣系統。磚和混凝土制成的通風管主要適用于與建筑物連接，阻力小，經久耐用。總之，通風管道的材料應根據應用條件綜合選擇。
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.
風管加工時的截面形狀一般分為矩形和圓形。在相同橫截面積的情況下，圓形通風管道不僅阻力小，而且強度高，節省了管道。對于圓形通風管道，直徑越小，制造越容易，保溫越方便。
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，矩形通風管道的管件比圓形通風管道的管件容易制作，布局也比圓形通風管道簡單。在正常情況下，當通風管的橫截面較小，管內流速較高時，宜采用圓形通風管。
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.
山東通風管道加工人員認為通風管道截面較大時，應采用矩形通風管道，并能充分利用建筑空間。對于矩形通風管道，寬高比越接近1越好，這樣不僅可以節省運行功率，還可以節省投資。
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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