What should I do if the hood smells bad and the return air is too big?

1, smoke exhaust pipe problem: solution:

The first problem, solution: If the hood pipe is under the ceiling, we can consider wrapping it tightly with transparent tape or sealing it with glass glue and sealant. If the hood duct is above the ceiling, there are two situations. If it is an integrated ceiling, remove a small piece and seal it with glass glue. If it is a gusset ceiling, it is necessary to remove part of the ceiling before gluing.

The second problem, solution: change a check valve or clean the check valve.

The third problem, solution: replace the exhaust hose or connect the exhaust hose.

The solution to the last question: This reason is more difficult to solve, and it is best to find a property.

2, flue check valve:

The flue check valve is the security guard of your home, which can effectively prevent the toxic waste gas and lampblack discharged from other people's homes in the public flue from flowing back into your home.