①、圆形风管展开面积，不扣除检查孔、测定孔、送风口、吸风口等所占面积，咬口重叠所占面积，咬口重叠部分也不增加。
①. The expansion area of circular air duct does not deduct the area occupied by inspection hole, measuring hole, air supply outlet, air suction outlet, etc., the area occupied by overlap of undercut, and the overlap of undercut does not increase.
②、风管风管风管风管长度计算，一律以施工图所示中心线长度为准，包括弯头、三通、变径管、天圆地方管件长度。
②. The length of air duct, air duct and air duct shall be calculated according to the length of the center line shown in the construction drawing, including the length of elbow, tee, reducer and local pipe fittings.
③、风管制作与安装定额包括：弯头、三通、变径管、天圆地方等管件及发兰、加固框和吊架、托架、支架的制作与安装。
③ the production and installation quota of air duct includes: the production and installation of elbows, tees, reducers, Tianyuan places and other pipe fittings as well as flanging, reinforcing frames and hangers, brackets and supports.
④、净化通风管道通风管道通风管道通风管道及部件制作与安装，工程量计算方法与一般通风管道相同，用相应定额。
④. Purification ventilation duct, ventilation duct, ventilation duct and parts manufacturing and installation. The calculation method of work quantity is the same as that of general ventilation duct, and the corresponding quota is used.
⑤、塑料风管、管件制作需要热煨，其木制胎具时，按一等枋材计价摊销。
⑤. The production of plastic air pipes and pipe fittings needs to be heated, and the wooden mould shall be priced and amortized according to the first-class brace.
⑥、当风管、管件、部件、非标准设备发生场外运输时，在场外生产的施工组织设计方案必须经过审批，其运输费按下方法计算：运费=车次数×车核定吨位×吨千米单价×里程车次数=加工件总质量/车次核定吨位×装载系数装载系数：非标准设备及通风部件为0.7;通风管及关件为0.5。不足一车按一车计算。
⑥ in case of off-site transportation of air pipes, pipe fittings, components and non-standard equipment, the construction organization design scheme for off-site production must be approved, and the transportation cost shall be calculated according to the following method: Freight = number of vehicles × approved tonnage × unit price of ton kilometers × mileage number of vehicles = total quality of processed parts / approved tonnage of vehicles × loading factor: 0.7 for non-standard equipment and ventilation components; ventilation 0.5 for pipes and fittings. Less than one car is calculated as one car.
⑦、通风管制作安装，按材质、风管形状、直径大小和钣料厚度而不论制作方法(咬口、焊接口)，分别套用定额。
⑦ for the manufacturing and installation of ventilation pipes, the norms shall be applied respectively according to the material, shape, diameter and thickness of the sheet metal regardless of the manufacturing method (undercut and welding joint).
⑧、薄钢钣风管中的钣材，实际要求不同时要换算，人工、机械不变。
⑧ the sheet metal in the thin steel sheet air duct shall be converted when the actual requirements are different, and the labor and machinery shall not be changed.
⑨、风管制作风管制作风管制作风管制作安装定额中发兰垫料是按各种材料品种综合考虑的，不得换算。
⑨ air duct production air duct production air duct production air duct production and installation quota hair blue cushion material is considered comprehensively according to various material types, no conversion is allowed.
⑩、整个通风系统通风系统通风系统通风系统设计采用渐缩管均匀送风者，圆形管按断面平均直径，矩形管按断面平均周长套用相应规定子目，其人工乘以系数2.5。空气幕送风管制作安装，按矩形风管断面平均周长套用相应风管规定子目，其人工成以系数3.0，期于不变。
(10) for the ventilation system of the ventilation system of the whole ventilation system, if the ventilation system is designed to supply air evenly with gradually reduced pipes, the circular pipes shall be based on the average diameter of the section, and the rectangular pipes shall be based on the average perimeter of the section, and the corresponding subitems shall be applied, and the coefficient shall be multiplied by 2.5. The air supply duct of air curtain shall be manufactured and installed according to the specified subitem of the corresponding duct according to the average perimeter of the rectangular duct section, and the artificial coefficient is 3.0, which is expected to remain unchanged.