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What about the smell of lampblack?

1. Install a one-way valve at the opening, which will open when exhausting and close when not exhausting.

2. The odor of the range hood may be caused by the bad function of the check valve in the flue. At this time, the check valve can be replaced directly.

3. If it is caused by cigarette-pouring or cigarette-stringing, you need to find a professional household appliance cleaning agency to deal with it.