How to prevent the common flue in the kitchen from pumping backwards?

1. During civil construction, two adjacent smoke outlets are not staggered, resulting in connectivity (judgment method: go to the neighbor's house to check whether there is * * *).

2. The height of the smoke outlet on the top floor is too low, the brick outlet is not blocked by the cover plate, and the cast iron smoke exhaust pipe has no rain cap, which leads to backward ventilation.

3. The smoke exhaust passage upstairs is blocked, resulting in poor smoke exhaust (find a thin thread of 10 meter, tie a heavy object at one end, and freely fall indoors, and observe whether the falling object passes through your house).

Suggested solution:

1. According to the above three possibilities, judge the cause of smoke flashback.

2. If two smoke outlets are connected, it needs to be handled by a professional company. You can contact the property management company or the civil engineering team for maintenance.

3, reasons 2, 3 can be handled by yourself, very simple.