Traditional hood just by fumes from the kitchen exhaust fan to exhaust fumes from the kitchen to the outdoor environment, so that the outdoor environment caused some pollution.
Traditional fume simulsions simply discharge the kitchen smoke into the outdoor environment through the fan, which causes some pollution to the outdoor environment.
The traditional lampblack machine only discharges the lampblack of the kitchen into the outdoor environment through the ventilator, which causes certain pollution to the outdoor environment.