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. 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. 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. 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. 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. The width of air duct and flange flange flange shall be 6-9mm, with tight and straight contact.
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. 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. 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. 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. 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. The insulation of outdoor iron sheet ventilation pipe shall be flat and smooth, and the undercut shall not be less than 20 ~ 25mm.