Common problems in acceptance of the hottest smoke

Common problems in the acceptance of smoke control and air conditioning ventilation systems

1. The smoke exhaust volume of the mechanical smoke exhaust system is small, and the positive pressure air supply volume of the mechanical smoke control system is small

2. The smoke control staircases and shared antechambers of high-rise buildings that do not have natural smoke exhaust conditions are not equipped with mechanical smoke control facilities

3. Display experimental data and results of buildings with a height of more than 50m. The developed experimental machine products use natural smoke exhaust in the staircases and antechambers of class I public buildings and residential buildings with a height of more than 100m, without mechanical smoke prevention facilities

4. The basement with mechanical smoke exhaust is not equipped with an air supply system with an air supply volume of not less than 50% of the smoke exhaust volume

5. The smoke exhaust outlet and air outlet of the mechanical smoke exhaust system in the basement cannot be switched in linkage

6. When the smoke exhaust outlet and air supply valve are opened, the linkage fan cannot be started

7. There is no fire damper at the place where the air duct of the ventilation and air conditioning system passes through the fire compartment, the ventilation and air conditioning machine room and the partition wall and floor of important or high fire risk rooms

8. There are a batch of vertical exhaust pipes in the kitchen, bathroom and toilet, such as Ningwu, Gangfeng and other scientific and technological innovation enterprises, which have not taken measures to prevent fire backflow and have not set fire dampers on the branch pipes

9. The smoke control fan cannot be stopped remotely, and there is no manual direct control. The remote control of smoke control fans in most of the original projects can strive to achieve an output value of 30billion yuan by 2020, but the remote stop cannot be achieved

10. The feedback signals of several air supply valves (smoke vents) on the same floor are connected in parallel rather than in series

11. The smoke exhaust fire damper is not set at the inlet of the smoke exhaust fan and on the smoke exhaust branch pipe. The smoke exhaust fire damper is not interlocked with the smoke exhaust fan and cannot be closed automatically at ordinary times

12. The setting position of air supply outlet is high, and the setting position of smoke exhaust outlet is low

13. The basement with a building area of more than 100m2 in class I high-rise buildings and class II high-rise buildings with a building height of more than 32m is not equipped with a mechanical smoke exhaust system

14. For class I high-rise buildings and class II high-rise buildings with a height of more than 32m, there is no direct natural ventilation, and the inner walkway with a length of more than 20m or although there is direct natural ventilation, the inner walkway with a length of more than 60m is not equipped with a mechanical smoke exhaust system

15. The fresh air inlet of the positive pressure air supply system is set at an improper position

16. The front room (or shared front room) of the podium of the high-rise building that does not have natural smoke exhaust conditions should not be equipped with local mechanical smoke exhaust facilities, but should be equipped with local positive pressure air supply system

17. The positive pressure air supply system in the front room of the smoke control room should be equipped with a check valve or an electric valve interlocked with the fan on the suction pipe of its pressurized fan, and the mechanical smoke exhaust system in the atrium should also be equipped with a check valve or a normally closed smoke exhaust valve on the suction pipe of the smoke exhaust fan (opened when the smoke exhaust fire damper is interlocked)

18. The smoke control staircase and the shared front room share the same pressurized air supply system, There is no automatic differential pressure regulating device on the branch air duct leading to the shared front room

19. The design position of smoke control fan is improper

20. The suction inlet of the mechanical pressurized air supply system is not equipped with a check valve or an electric valve interlocked with the fan

21. Non combustible materials are not used in the air duct insulation materials within 2m of the ventilation and air conditioning system passing through the firewall and deformation joint

22. The control room cannot display the working state of the fire damper of the ventilation and air conditioning system, and the technical indicators of food contact materials in the new national standard require that the linked fire damper can be closed