風管及管道部件設計過程中常用的計算方法

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風管安裝按施工圖示不同規格以展開“面積”計算，不扣除檢查孔、測定孔、送風口、吸風口等所占面積。計算風管長度時，一律以施工圖示中心線長度為準（主管與支管以其中心線交點劃分），包括彎頭、三通、變徑管、天圓地方等管件的長度，但不得包括帆布、風閥、消聲器、設備所占長度。直徑和周長按圖示尺寸為準展開。報價時定額已含損耗，計算結果不需要乘損耗系數。

The installation of air ducts shall be calculated based on different specifications as shown in the construction drawings, without deducting the area occupied by inspection holes, measuring holes, air supply outlets, suction outlets, etc. When calculating the length of the air duct, the length of the centerline on the construction drawing shall be used as the standard (the main pipe and branch pipe shall be divided by the intersection point of the centerline), including the length of fittings such as elbows, tees, variable diameter pipes, and skylines, but shall not include the length occupied by canvas, air valves, silencers, and equipment. The diameter and circumference shall be unfolded according to the dimensions shown in the diagram. When quoting, the quota already includes losses, and the calculation results do not need to be multiplied by the loss coefficient.

薄鋼板通風管道、凈化通風管道，復合型風管（玻纖板、不燃無機復合風管），報價定額內已包括法蘭、加固框和吊托支架，不另行計算。但不包括過跨風管落地支架，因此過跨風管落地支架需按圖按規范計算重量。

Thin steel plate ventilation ducts, purification ventilation ducts, composite air ducts (fiberglass board, non combustible inorganic composite air ducts), the quotation quota already includes flanges, reinforcement frames, and suspension brackets, and will not be calculated separately. However, it does not include the ground support for cross span air ducts, so the weight of the ground support for cross span air ducts needs to be calculated according to the drawings and specifications.

不銹鋼通風管道、鋁板通風管道，風管咬口連接中報價定額包括管件、法蘭，但不包括吊托支架，焊接連接中報價定額僅包括管件，不包括法蘭和吊托支架，其工程量以“kg”為計量單位，故根據風管連接方式按設計說明或規范計算法蘭和吊托支架重量。

The quotation quota for stainless steel ventilation ducts, aluminum plate ventilation ducts, and air duct bite connections includes fittings and flanges, but does not include suspension brackets. The quotation quota for welded connections only includes fittings, but does not include flanges and suspension brackets. The quantity of work is measured in kilograms. Therefore, the weight of flanges and suspension brackets is calculated according to the design instructions or specifications based on the air duct connection method.

（參考已施工項目結算數據：法蘭（不銹鋼角鐵3#）的含量測算0.9kg/m2；吊托支架（不銹鋼角鐵4#、不銹鋼槽鋼6#）含量測算1.5kg/m2；若其他項目有類似工程請及時提供數據及時更正。）

(Referring to the settlement data of the constructed project: the content of flange (stainless steel angle iron 3 #) is calculated to be 0.9kg/m2; The content of the suspension bracket (stainless steel angle iron 4 #, stainless steel channel steel 6 #) is calculated to be 1.5kg/m2; If other projects have similar projects, please provide data in a timely manner for timely correction

風管軟接：

Flexible connection of air ducts:

（1）帆布接口，按圖示尺寸以“”計算，一般寬度為250mm，具體以現場制作經驗考慮；

(1) Canvas interface, calculated in square meters according to the dimensions shown in the diagram, with a general width of 250mm, specific considerations based on on-site production experience;

（2）軟管風管，按圖紙尺寸以“米”計算。

(2) Flexible hose duct, calculated in meters according to the dimensions on the drawing.

風管導流葉片，按風管規格計算彎頭個數，按下表計算導流葉片“面積”。

Calculate the number of bends according to the specifications of the air duct, and calculate the "area" of the guide vanes according to the table below.

風口風閥，按不同類型（防火閥、蝶閥、對開多葉閥、散流器、百葉等）不同規格以“個”為計量單位（按成品計算）。

The air vent valve is measured in units of "pieces" according to different types (fire dampers, butterfly valves, split multi leaf valves, diffusers, louvers, etc.) and specifications (calculated as finished products).

消聲器、消聲靜壓箱、靜壓箱，按不同規格以“臺”為計量單位（按成品計算），除設計要求現場制作時以“”（展開六個面面積）計算。

Silencers, silencing static pressure boxes, and static pressure boxes shall be measured in units of "units" according to different specifications (calculated as finished products), and shall be calculated in "square meters" (expanding the six surface areas) unless required by the design for on-site production.

防蟲網以“個”計算或者以“”計算，組價人員可根據需要自行換算。

Insect proof nets are calculated in units or square meters, and pricing personnel can convert them according to their needs.

設計說明有需要風管檢查孔與風管測定孔的，檢查孔按下表換算，以重量計算，測定孔按其型號以“個”為計量單位。

If there is a need for air duct inspection holes and air duct measurement holes in the design specifications, the inspection holes shall be converted according to the table below, calculated by weight, and the measurement holes shall be measured in "pieces" according to their model.

過墻套管采用2mm厚鋼板或其他厚度時（按設計圖紙）以“面積”計算。

When the wall sleeve is made of 2mm thick steel plate or other thicknesses (according to the design drawings), it is calculated as "area".

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