1. Insufficient air volume of the range hood: If the air volume of the range hood is not large enough, it is impossible to exhaust all the kitchen fumes.

2. The exhaust pipe of the range hood is blocked: If the exhaust pipe of the range hood is blocked by lampblack or dust, lampblack cannot be discharged.

3. Dirty filter screen of range hood: If the filter screen of range hood is dirty, it will affect the exhaust effect of lampblack.

4. Poor ventilation in the kitchen: If the kitchen is poorly ventilated, it will cause the oil fume to be discharged in time.

5. Incorrect installation position of range hood: If the installation position of range hood is incorrect, it will affect the exhaust effect of lampblack.

Solution:

1. Replace the range hood with large air volume.

2. Clean the exhaust pipe and keep it unblocked.

3. Regularly clean the filter screen of the range hood.

4. To improve the ventilation effect of the kitchen, you can install a ventilator or open a window for ventilation.

5. Adjust the installation position of the range hood to ensure that the lampblack can be effectively discharged.