1. Jinan air duct processing quantity calculation, regardless of material, is based on the length of the air duct center line in the construction drawing, and is calculated according to the unfolded area of different cross-section shapes (circle, square and moment), measured in square meters.

①、圓形風管展開面積，不扣除檢查孔、測定孔、送風口、吸風口等所占面積，咬口重疊所占面積，咬口重疊部分也不增加。

① The developed area of circular air duct does not deduct the area occupied by inspection hole, measuring hole, air supply outlet and air suction outlet, and the overlapping area of biting does not increase.

②風管加工長度計算，一律以施工圖所示線長度為準，包括彎頭、三通、變徑管、天圓地方管件長度。支管長度以支管線與主管線交接點為分界點。風管長度不包括部件所占長度，其部件長度值見下表：序號 部件名稱 部件長度 序號 部件名稱 部件長度 1 蝶閥 150 4 圓形風管防火閥 D+240 2 止回閥 300 5 矩形風管防火閥 B+240 3 密閉式對開多頁調節 閥 210 注：D為風管外徑，B為方風管外邊高。

② The processing length of air duct shall be calculated according to the center line length shown in the construction drawing, including the length of elbow, tee, reducing pipe and pipe fitting at Tianyuan place. The length of branch pipe is divided by the junction point between the center line of branch pipe and the center line of main pipe. The length of the air duct does not include the length of the components. The length values of the parts are shown in the following table: serial number component name part length serial number part length 1 butterfly valve 150 4 circular air duct fire damper D + 240 2 check valve 300 5 rectangular air duct fire damper B + 240 3 closed type split multi leaf regulating valve 210 note: D is the outer diameter of the air duct, B is the outer edge height of the square air duct.

③、風管加工與安裝定額包括：彎頭、三通、變徑管、天圓地方等管件及發蘭、加固框和吊架、托架、支架的制作與安裝。未計價材料計算了鈑材料，而發蘭和支架、吊架、托架按定額規定計算其價值后，還要計算其材料數量，并按規格、品種列入材料匯總表中。風管制作與安裝定額不包括：過跨風管的落地支架制作安裝。落地支架以“千克”計量,使用第九篇《通風空調工程》定額第七章設備支架子目。

③ Air duct processing and installation norms include: elbow, tee, reducing pipe, Tianyuan place and other pipe fittings and flange, reinforcement frame and hanger, bracket, bracket and installation. The sheet material is calculated for the unpriced materials, and after the value of the flange, bracket, hanger and bracket is calculated according to the quota, the material quantity shall be calculated and listed in the material summary table according to the specifications and varieties. The production and installation quota of air duct does not include: the manufacture and installation of floor support for crossing air duct. The floor support is measured in kilogram, and the equipment support subitem in Chapter 7 of the quota of Chapter IX ventilation and air conditioning engineering is used.

④、凈化通風管道及部件制作與安裝，工程量計算方法與一般通風管道相同，用相應定額。但是零部件安裝要計算凈化費，按相應部件子目安裝基價的35%作為凈化費，其中人工費占40%。對凈化管道與建筑物縫隙之間所作的精華密封處理，按實計算費用。

④ For the fabrication and installation of purification ventilation pipeline and components, the calculation method of engineering quantity is the same as that of general ventilation pipeline, and the corresponding quota is used. However, the purification cost should be calculated for the installation of parts, and 35% of the basic installation price of the corresponding component subitems is taken as the purification cost, of which the labor cost accounts for 40%. The essence seal treatment between the purge pipe and the building gap is processed according to the actual cost.