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　　風管制作安裝以施工圖規格不同按展開面積計算，不扣除檢查孔、測定孔、送風口、吸風口等所占面積。不同形狀的風管，計算方法如下：1、圓形風管：π×D×L D為直徑，L-管道中心線長度。2、方形風管：（A+B）×L×2 A、B為橫截面的長和寬，L-管道中心線長度。3、彎頭：πD×1.5D×2π/B B為定值：90°彎頭 B=4；45°彎頭 B=8。如圖1所示，風管由A，B，L三個尺寸組成，其中A表示寬，B表示高，L表示長，單位無特殊說明都是mm，風管的展開面積計算公式為S=2(A+B)×L，一般按工程需要單位需要換算成m，比如A×B×L=500×200×5000表示風管的寬為500mm，管道的高為200mm，管道的長為5000mm，則按風管的展開面積按風管的展開面積計算公式得出S=2(A+B)×L=2（0.5+0.2）×5=7㎡

　　The production and installation of air ducts shall be calculated based on the unfolded area according to different construction drawing specifications, without deducting the area occupied by inspection holes, measuring holes, air supply outlets, suction outlets, etc. The calculation method for different shapes of air ducts is as follows: 1. Circular air duct: π× D × L D is the diameter, L - the length of the pipeline centerline. 2. Square duct: (A+B) × L × 2 A, B are the length and width of the cross-section, L - the length of the centerline of the duct. 3. Bend: π D × 1.5D × 2 π/B is a fixed value: 90 ° bend B=4; 45 ° elbow B=8. As shown in Figure 1, the air duct consists of three dimensions: A, B, and L. A represents width, B represents height, and L represents length, with units in millimeters unless otherwise specified. The calculation formula for the unfolded area of the air duct is S=2 (A+B) × L, which is generally converted to meters according to engineering needs. For example, A × B × L=500 × 200 × 5000 means that the width of the air duct is 500mm, the height of the pipeline is 200mm, and the length of the pipeline is 5000mm. Based on the unfolded area of the air duct, the calculation formula for the unfolded area of the air duct is S=2 (A+B) × L=2 (0.5+0.2) × 5=7 ㎡

　　注意事項：

　　Notes:

　　1、通風管道彎頭的表面積計算規則是管道延伸至相交的中心線計算。

　　1. The calculation rule for the surface area of ventilation duct elbows is to extend the duct to the intersecting centerline.

　　2、三通：定額計算規則中規定：風管長度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，但不得包括部件所占長度，直徑和周長以圖示尺寸為準（變徑管、天圓地方均按大頭口徑尺寸計算），咬口重疊部分已包括在定額內，不得另行增加，僅供參考。

　　2. Three way: According to the quota calculation rules, the length of the air duct shall be based on the centerline length in the construction drawing (the main and branch pipes shall be divided by the intersection point of their centerlines), including the length of elbows, tees, variable diameter pipes, celestial circles and other fittings, but not including the length occupied by the components. The diameter and circumference shall be based on the dimensions in the drawing (variable diameter pipes and celestial circles shall be calculated according to the size of the large head diameter). The overlapping part of the bite is already included in the quota and cannot be added separately, for reference only.

　　工程量計算規則：

　　Calculation rules for engineering quantity:

　　一、風管按設計圖示以展開面積計算，以平方米為計量單位，檢查孔、測定孔、送風口、吸風口所占面積不除。風管展開面積不包括風管、管口重疊部分面積。

　　1、 The air duct is calculated based on the unfolded area according to the design drawing, measured in square meters, excluding the area occupied by inspection holes, measuring holes, air supply outlets, and suction outlets. The unfolded area of the air duct does not include the overlapping area of the air duct and the pipe mouth.

　　二、風管長度計算時一律以圖示中心線長度為準(主管與支管以其中心線交接點劃分)，包括彎頭、三通、變管、天圓地方等管件的長度，但不得包括部件所占的長度。

　　2、 When calculating the length of air ducts, the centerline length shown in the diagram shall prevail (the main and branch pipes shall be divided by the intersection point of their centerlines), including the length of fittings such as elbows, tees, transformers, and roundabouts, but not including the length occupied by the components.

　　三、風管導流葉片制作安裝按圖示葉片的面積計算，以平方米為計量單位。

　　3、 The production and installation of air duct guide blades shall be calculated based on the area of the blades shown in the diagram, measured in square meters.

　　四、風管檢查孔制作安裝按設計圖示尺寸計算重量，以千克為計量單位。

　　4、 The production and installation of air duct inspection holes shall be measured in kilograms according to the dimensions shown in the design drawings.

　　五、溫度、風量測定孔制作安裝依據其型號，按設計圖示數量計算，以個為計量單位。

　　5、 The production and installation of temperature and air volume measurement holes shall be based on their models, calculated according to the quantity shown in the design drawings, and measured in units of units.

　　六、柔性軟風管安裝按設計圖示中心線長度計算，以米為計量單位；柔性軟風管閥門安裝按設計圖示數量算,以個為計量單位。

　　6、 The installation of flexible air ducts shall be calculated based on the centerline length shown in the design drawings, measured in meters; The installation of flexible air duct valves shall be measured in units of units according to the quantity shown in the design drawings.

　　七、軟管(帆布)接口制作安裝按圖示尺寸，以平方米為計量單位。

　　7、 The production and installation of hose (canvas) interfaces shall be measured in square meters according to the dimensions shown in the diagram.

　　八、風管運輸按薄鋼板通風管道、靜壓箱、罩類等按展開面積計算，以平方米為計量單位。

　　8、 The transportation of air ducts is calculated based on the unfolded area of thin steel plate ventilation ducts, static pressure boxes, covers, etc., measured in square meters.

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