How to find out the causes of smoke leakage in kitchens of 1 and 2 units?

1. If there is water seepage in the flue upstairs and downstairs, it means that the construction party has not made a good waterproof device at the top, and rainwater enters the flue along the pipeline, or there is water at the outlet of the flue, and water seeps along the flue. In this case, it is best to find a property right away. You can drain the accumulated water first, and then add a rain-proof device at the exit of the flue.

2. There is water seepage in the flue of the house, but no water seepage is found in the neighbors upstairs and downstairs. It is also possible that the kitchen of the neighbor's house upstairs leaks water and then seeps down the flue wall. This situation can be discussed with the neighbors upstairs, turn off the main water valve, the kitchen will not use water for 24 hours, and then observe whether there is water seepage downstairs, and then solve it in detail.