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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、管道吊架距法蘭距離不小于20mm。柔性短管長度為150~300mm.金屬軟管及非金屬軟管長度不得大于2m,并不用有死彎或塌凹。

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、主通風管道吊架距支管之間的距離應不小于200mm。

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

4、法蘭螺栓孔距低壓送風不大于200mm，中壓送風距離不大于100mm。5 ) 通風管道彎頭處、三通處、閥門處、必須加吊架、管道長度超過15m,防晃支架不得少于一個。

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、通風管道吊架距不保溫通風管道邊緣為30mm，距保溫通風管道保溫層邊緣距離為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、通風管道保溫應平整，法蘭處必須單獨保溫，法蘭保溫材料應與管道一致。通風管道水平度為3‰，垂直度2‰，總體偏差均不大于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、通風管道與法蘭壓邊寬度應為6~9mm，接觸嚴密并順直。

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

9、玻璃鋼通風管道法蘭連接，法蘭螺栓間距不大于120mm,法蘭間距均勻，法蘭平整，法蘭墊片厚度為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、玻璃鋼通風管道長度超過20m時，應加固定支架不得少于一個，玻璃鋼通風管道長度超過20m時應按設計要求加伸縮節。

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、通風管道穿伸縮縫處應采用軟連接，軟管長度為伸縮縫寬度加100mm。通風管道保溫材料為巖棉時保溫應采用鐵角包裝帶，打包帶間距為0.6~0.7m。通通風管道規格在400mm以下的支吊架間距不大于4m,規格在400mm以上的通風管道支吊架間距不大于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、通風管道垂直安裝，支架間距不大于4m,玻璃鋼管不大于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、排通風管道與屋面風機連接應墊6mm的橡膠墊，鍍鋅螺栓應加平光墊和彈簧墊圈。

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、室外鐵皮通風管道保溫應平整、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.