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Punching screws on the flue will definitely open the flue, because the flue wall is relatively thin. It is to check whether there is a problem with the anti-air door of your kitchen range hood, such as being stuck by oil smoke and not being able to buckle the air outlet.
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It's okay, it's best to seal it with sealant to avoid air leakage.
If there is no problem in the mind, it will be fine.
This is something that is bound to happen in the kitchen, so don't worry.
It's perfectly possible to walk one. But there must be a good unobstructed flue of lyrics. There is also the return of the flue.
Hehe, I'm dizzy.
If it hasn't been dispersed, you can take it to quick-freeze, isn't it good again? >>>More
Another small round hole is the exhaust hole of the water heater, which is usually 8 cm in diameter.