Solution:

Knowing the causes of oil fume backflow and poor smoke exhaust, the solution is easy to handle. As long as a tightly closed and tightly opened check valve is installed at the outlet of the range hood, the problems of oil fume backflow and poor smoke exhaust can be eliminated. Common sense tells us that the door is closed, and the biggest wind can't get in. The reason to solve the oil fume backflow is as simple as that.

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

The high-volume range hood is really comfortable for its own use, but it brings the hidden danger of lampblack reflux to neighbors. Similarly, the installation of large-volume range hoods by neighbors will also bring you the hidden danger of oil fume reflux.

At present, there is an "electric smoke sealing valve", which is kept closed by a strong spring when the range hood is closed and will not automatically open due to positive and negative pressure in the flue; When the range hood is turned on, the motor is used to overcome the spring force and the adhesion of oil dirt, which is not afraid of the adhesion of oil dirt and has no air leakage ring, thus truly achieving "opening in place and closing tightly".

Pay attention to your choice when buying a range hood.

1. Check whether the outlet of the flue, that is, the inlet of the hood hose, has been changed from the front of the flue to the side during the transformation. Because the side width of the side auxiliary flue is only 100mm, which is much narrower than the big side. According to the aerodynamic principle, you change the air inlet to the position of the auxiliary flue, which reduces the rising speed of air discharge and increases the resistance of discharge. When there is convection between the air in your kitchen and the flue, the air pressure in the kitchen will be lower than that in the flue. Even if your range hood doesn't work, the same result will inevitably lead to smoke backflow. It must be changed back.

2. Check whether a check valve, also called flue connector, is installed. Conditional can buy backflow prevention check valve.

3. Whether the kitchen door or window is open. If the windows of your range hood don't open when working, air convection can't be formed, and the lampblack can't be discharged at all; When the range hood is not working, if you don't open the window, the air pressure in your kitchen will be less than that in the flue, and it is inevitable that the lampblack from other people's homes will flow back to your home.

4. Check whether the power of your range hood reaches 500m? /h, if not, please replace it in time.

5. Check whether the fume emission of the building where you live (according to the design regulations, the fume emission should be discharged separately) is received by the flue of the residential kitchen. If so, then I congratulate you, the oil fume will always flow back to your home. Because the power of the catering range hood is 2000m? /h, both the emission quantity and the emission speed are bigger and faster than your range hood.