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If you are sure that the smell flows into your home through the flue and not through the window, then it will be easy to do, you open the ceiling of the kitchen, see if there is a gap between the flue and the range hood, if not, there is a thing called check valve at the opening of the flue, it is not expensive one or twenty yuan, just change it!
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This is all caused by changing the flue, so it will be used.
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If you don't install it well, look for after-sales people. It may be that the flue is blocked!
This is often said to be fume backfilling, if the flue mouth on the wall is not installed with a fume valve, please install one, pay attention not to lose the big because of the small, try to pick the best, the fume backflow is not serious can generally be solved. If the fume backflow is very serious, or the fume valve has been installed at the flue mouth, you can only install an electric fume valve at the air outlet of the hood, of course, you can also install the electric fume valve directly in one step.
1. Do not use integrated ceilings, although this will make the floor height lower; >>>More
It is common to smell the smell of oil fumes, poor backflow prevention devices, or poor sealing. >>>More
Why do you say you can't install it? Tell me about it? Maybe we have it here?
If it's dry, just use a larger exhaust fan.