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 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风管加工长度计算，一律以施工图所示线长度为准，包括弯头、三通、变径管、天圆地方管件长度。支管长度以支管线与主管线交接点为分界点。风管长度不包括部件所占长度，其部件长度值见下表：序号 部件名称 部件长度 序号 部件名称 部件长度 1 蝶阀 150 4 圆形风管防火阀 D+240 2 止回阀 300 5 矩形风管防火阀 B+240 3 密闭式对开多页调节 阀 210 注：D为风管外径，B为方风管外边高。
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 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 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.