1. For horizontal installation of ventilation pipes, the allowable deviation of levelness shall not be greater than 3m m per m, and the total deviation shall not be greater than 20mm; for vertical installation of ventilation pipes, the allowable deviation of verticality shall not be greater than 2mm per m, and the total deviation shall not be greater than 20mm.

2、管道吊架距法兰距离不小于20mm。柔性短管长度为150~300mm.金属软管及非金属软管长度不得大于2m,并不用有死弯或塌凹。

2. The distance between pipe hanger and flange shall not be less than 20 mm. The length of flexible short pipe is 150-300 mm. The length of metal hose and non-metal hose shall not be more than 2 m, and there is no dead bend or collapse.

3、主通风管道吊架距支管之间的距离应不小于200mm。

3. The distance between the main ventilation pipe hanger and the branch pipe shall not be less than 200mm.

4、法兰螺栓孔距低压送风不大于200mm，中压送风距离不大于100mm。5 ) 通风管道弯头处、三通处、阀门处、必须加吊架、管道长度超过15m,防晃支架不得少于一个。

4. The distance between the flange bolt hole and the low-pressure air supply shall not be greater than 200mm, and the distance between the middle pressure air supply shall not be greater than 100mm. 5) hangers must be added at the elbows, tees and valves of the ventilation pipes. The length of the pipes is more than 15m, and there shall be no less than one anti sway support.

6、通风管道吊架距不保温通风管道边缘为30mm，距保温通风管道保温层边缘距离为30mm。

6. The distance between the hanger of the ventilation pipe and the edge of the uninsulated ventilation pipe is 30mm, and the distance between the hanger and the edge of the insulation layer of the insulated ventilation pipe is 30mm.

7、通风管道保温应平整，法兰处必须单独保温，法兰保温材料应与管道一致。通风管道水平度为3‰，垂直度2‰，总体偏差均不大于20mm。

7. The thermal insulation of the ventilation pipe shall be flat, and the flange must be insulated separately, and the flange thermal insulation material shall be consistent with the pipe. The levelness and perpendicularity of ventilation pipes are 3 ‰ and 2 ‰, and the overall deviation is not more than 20 mm.

8、通风管道与法兰压边宽度应为6~9mm，接触严密并顺直。

8. The width of air duct and flange flange flange shall be 6-9mm, with tight and straight contact.

9、玻璃钢通风管道法兰连接，法兰螺栓间距不大于120mm,法兰间距均匀，法兰平整，法兰垫片厚度为3~5mm。

9. For flange connection of FRP ventilation pipe, the distance between flange bolts shall not be more than 120mm, the distance between flanges shall be uniform, the flange shall be flat, and the thickness of flange gasket shall be 3-5mm.

10、玻璃钢通风管道长度超过20m时，应加固定支架不得少于一个，玻璃钢通风管道长度超过20m时应按设计要求加伸缩节。

10. When the length of FRP ventilation pipe exceeds 20 m, at least one fixed support shall be added. When the length of FRP ventilation pipe exceeds 20 m, expansion joint shall be added according to the design requirements.

11、通风管道穿伸缩缝处应采用软连接，软管长度为伸缩缝宽度加100mm。通风管道保温材料为岩棉时保温应采用铁角包装带，打包带间距为0.6~0.7m。通通风管道规格在400mm以下的支吊架间距不大于4m,规格在400mm以上的通风管道支吊架间距不大于3m.

11. Flexible connection shall be adopted at the place where the ventilation pipe passes through the expansion joint, and the length of the hose shall be the width of the expansion joint plus 100mm. When the thermal insulation material of the ventilation pipe is rock wool, the iron angle packing belt shall be used for thermal insulation, and the spacing of the packing belt shall be 0.6 ~ 0.7m. The distance between the supports and hangers of the ventilation pipe with the specification less than 400mm shall not be more than 4m, and the distance between the supports and hangers of the ventilation pipe with the specification more than 400mm shall not be more than 3m

13、通风管道垂直安装，支架间距不大于4m,玻璃钢管不大于3m。

13. The ventilation pipe shall be installed vertically, and the support spacing shall not be more than 4m, and the glass steel pipe shall not be more than 3m.

14、排通风管道与屋面风机连接应垫6mm的橡胶垫，镀锌螺栓应加平光垫和弹簧垫圈。

14. 6mm rubber pad shall be used for the connection between exhaust ventilation pipe and roof fan, and flat mat and spring washer shall be added for galvanized bolt.

15、室外铁皮通风管道保温应平整、光滑、咬口不小于20~25mm。

15. The insulation of outdoor iron sheet ventilation pipe shall be flat and smooth, and the undercut shall not be less than 20 ~ 25mm.