1. Check valves can be used, which can be divided into flue check valves and range hood check valves, which can solve the problem of odor returning from flue. Usually, builders will equip them when handing over the house, and the ventilation caliber is generally 15cm, and there are metal baffles with eccentric shafts inside. Aluminum foil tape will connect the smoke pipe of the range hood with the smoke prevention treasure you have chosen. This process is very easy. You can do it yourself at home, but please note that the joints must be blocked with dry gypsum.

2. You can also buy a bottle of glass glue. It is best to seal the bottom layer with glass glue, and it will last a little longer. Use glass glue where there are seams, so that the oil fume has nowhere to hide and can only be directly discharged along the oil fume pipeline.

3. It is best to install the check valve when bricklayer is wrapping the pipeline. A good smoke prevention treasure can be as long as the ceiling and does not need to be removed in the middle, which can effectively solve the problem of oil smoke in the house.

extended information

installing a tightly closed and open check valve at the outlet of the range hood can eliminate the backward flow of oil smoke and poor smoke exhaust. Common sense tells us that the door is tightly closed, and the biggest wind can't leak in. The reason to solve the problem of oil fume backflow is as simple as that.

However, it is difficult to "close tightly" the check valve on the hood or the check valve installed later. Due to structural reasons, these valves will be sucked open when the system is under negative pressure, especially when the installed hood has an increasing air volume, the probability of negative pressure is increasing, and the frequency of oil fume backflow is also increasing.

Reference: Baidu Encyclopedia-range hood