This kind of situation is what people often say: oil fume is poured backwards. So what caused it? Here's a good explanation for you:
The first situation: Now many high-rise and multi-storey houses are treated centrally from the roof with flue. The disadvantage is that as long as there is one cook in the whole building, it can bypass the flue and flow backward to other households.
If it is a public flue, will it show oil fume backflow? be
Today's flue has primary and secondary planning, which can resist 50%. In addition, the home range hood check valve can block 10%, and the flue check valve can also resist 30%. Besides, 10% can't help it.
But the remaining 10% is fine, basically nothing serious. Many people don't open and close the one-way valve well because the one-way valve piece on the range hood is stuck with oil dirt, and the consequence is that the exhaust is not ideal, and a large number of such phenomena appear.
In this case, it is best to replace only a new range hood check valve. If the elasticity and tightness are a little higher, it is best to reinstall an adjustable part in the ventilator vent.
The second situation: the smoke pipe is broken.
Let's take a look at it first: the smoke pipe, also called the exhaust pipe, is a square hole designed in the residential wall. Its principle of use is: under the action of the range hood, the oil fume gas goes along the vertical flue connecting the hose, then rises through the flue, and finally goes out from the air outlet of the roof.
If the inner wall of the flue is rough, it will increase the friction force in the process of oil fume rising, and the resistance will slow down when the oil fume is discharged upward through the exhaust duct, resulting in a lot of oil fume being blocked together, forming oil fume recharge.
How to check whether it is a flue problem: open the smoke outlet of the roof smoke pipe to see if it is blocked. At night, you can use a strong flashlight to light the smoke pipe to see if it is sealed by sundries.
Treatment: professional treatment of flue, and then care, forming a protective film, so that oil stains are not easy to stay on the surface.
The third case: the pipe of someone else's range hood does not reach the flue, so it flows out through the casing of the gas pipe.
Solution: Contact the property and check the range hood pipeline of the user downstairs.
To sum up, no matter the shortcomings of check valves or smoke pipes, it is not difficult to solve them. The most important thing is whether we can find the source correctly. I hope you can read it carefully and do it yourself without consulting a master.