通風(fēng)管道：計算通風(fēng)管道的規則

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　　各種通風(fēng)管道設計制作安裝依據材質(zhì)、形狀、周長(cháng)或直徑、板材厚度、接口形式，按設計圖示以展開(kāi)面積計算，不扣除檢查孔、測定孔、送風(fēng)口、吸風(fēng)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(fēng)管長(cháng)度一律以設計圖示中心線(xiàn)長(cháng)度為準，包括彎頭、三通、變徑管、天圓地方等管件的長(cháng)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(fēng)管展開(kāi)面積不包括風(fēng)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(cháng)按圖注尺寸為準展開(kāi)。

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

　　整個(gè)通風(fēng)管道設計系統設計采用漸縮管均勻送風(fēng)者，圓形風(fēng)管按平均直徑、矩形風(fēng)管按平均周長(cháng)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.