风管制作安装以施工图规格不同按展开面积计算，不扣除检查孔、测定孔、送风口、吸风口等所占面积。不同形状的风管，计算方法如下：1、圆形风管：π×D×L D为直径，L-管道中心线长度。2、方形风管：（A+B）×L×2 A、B为横截面的长和宽，L-管道中心线长度。3、弯头：πD×1.5D×2π/B B为定值：90°弯头 B=4；45°弯头 B=8。如图1所示，风管由A，B，L三个尺寸组成，其中A表示宽，B表示高，L表示长，单位无特殊说明都是mm，风管的展开面积计算公式为S=2(A+B)×L，一般按工程需要单位需要换算成m，比如A×B×L=500×200×5000表示风管的宽为500mm，管道的高为200mm，管道的长为5000mm，则按风管的展开面积按风管的展开面积计算公式得出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 ㎡

　　注意事项：

　　Notes:

　　1、通风管道弯头的表面积计算规则是管道延伸至相交的中心线计算。

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

　　2、三通：定额计算规则中规定：风管长度一律以施工图示中心线长度为准（主管与支管以其中心线交点划分），包括弯头、三通、变径管、天圆地方等管件的长度，但不得包括部件所占长度，直径和周长以图示尺寸为准（变径管、天圆地方均按大头口径尺寸计算），咬口重叠部分已包括在定额内，不得另行增加，仅供参考。

　　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.

　　工程量计算规则：

　　Calculation rules for engineering quantity:

　　一、风管按设计图示以展开面积计算，以平方米为计量单位，检查孔、测定孔、送风口、吸风口所占面积不除。风管展开面积不包括风管、管口重叠部分面积。

　　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、风管长度计算时一律以图示中心线长度为准(主管与支管以其中心线交接点划分)，包括弯头、三通、变管、天圆地方等管件的长度，但不得包括部件所占的长度。

　　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、风管导流叶片制作安装按图示叶片的面积计算，以平方米为计量单位。

　　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、风管检查孔制作安装按设计图示尺寸计算重量，以千克为计量单位。

　　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、温度、风量测定孔制作安装依据其型号，按设计图示数量计算，以个为计量单位。

　　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、柔性软风管安装按设计图示中心线长度计算，以米为计量单位；柔性软风管阀门安装按设计图示数量算,以个为计量单位。

　　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、软管(帆布)接口制作安装按图示尺寸，以平方米为计量单位。

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

　　八、风管运输按薄钢板通风管道、静压箱、罩类等按展开面积计算，以平方米为计量单位。

　　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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