通風管道：計算通風管道的規則

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　　各種通風管道設計制作安裝依據材質、形狀、周長或直徑、板材厚度、接口形式，按設計圖示以展開面積計算，不扣除檢查孔、測定孔、送風口、吸風口等所占面積。

　　The design, production, and installation of various ventilation ducts are based on material, shape, perimeter or diameter, plate thickness, and interface form. They are calculated based on the unfolded area according to the design diagram, without deducting the area occupied by inspection holes, measuring holes, air supply outlets, suction outlets, etc.

　　風管長度一律以設計圖示中心線長度為準，包括彎頭、三通、變徑管、天圓地方等管件的長度。

　　The length of the air duct shall be based on the centerline length shown in the design drawing, including the length of fittings such as elbows, tees, variable diameter pipes, and round pipes.

　　風管展開面積不包括風管、管口重疊部分面積。

　　The unfolded area of the air duct does not include the area of the overlapping parts of the air duct and pipe openings.

　　直徑和周長按圖注尺寸為準展開。

　　The diameter and perimeter shall be expanded according to the dimensions indicated in the drawing.

　　整個通風管道設計系統設計采用漸縮管均勻送風者，圓形風管按平均直徑、矩形風管按平均周長計算，以為計量單位。

　　The entire ventilation duct design system adopts a uniform air supply system with tapered pipes, with circular ducts calculated based on average diameter and rectangular ducts calculated based on average circumference, measured in square meters.