I installed a flue check valve, but the backflow is still very serious, especially when eating. My family doesn't cook, and there is oil smoke coming to my house. How to solve it?

1. It is very likely that the whole flue was not designed well in the early stage. If the developer chooses the flue, he can complain to the property. If the upper and lower neighbors have backflow at the same time, it is necessary to rectify the entire exhaust system on a large scale. It may be that the valve used by the developer is not good enough to cause backflow. You can try a better valve, try Wanju's five-prevention valve, and suggest the overall replacement effect.

2. Check whether the flue of the public flue is damaged, or the pipeline of the public flue is not thick enough, which is also the developer's problem. If it is damaged, it is recommended to complain to the property and let it be handled. If this happens to both neighbors, it is recommended to negotiate with the developer. The problem is not small.