1, the check valve is installed backwards, so it can't work and needs to be reinstalled.

2. There is a gap between the check valve and the wall, which can be blocked with cement mortar.

3, check valve installation error, must be installed in the auxiliary flue.

4. The lampblack pipe is too long to discharge lampblack.

Second, how to install the kitchen check valve

1. If the ceiling is not installed in the kitchen, you can directly install a check valve at the smoke outlet of the kitchen.

2. If the ceiling has been installed in the kitchen and you don't want to remove the ceiling, you can install a check valve on the range hood.

3. Remove the smoke pipe of the range hood, then install it at the cigarette holder, fix the base, install the check valve, and let the fan open toward the inside of the flue seal.

4. Sealing with sealant can better ensure that the oil smoke does not enter the kitchen from the gap.

5. Stick the flue pipe on the check valve with adhesive tape, and then check whether there is air leakage. If there is air leakage, it can be repaired with glass glue.

I'm here to introduce what to do if the kitchen is equipped with a check valve or the smell is serious. I hope it helps.