And the traditional hood needs its own to open or closed, it needs its own to adjust the size of the air flow, such as the hood is neither convenient nor environmentally friendly, but still a waste of electricity.
And the traditional smoke machine needs to open or off, also need to adjust their own air flow size, such a smoke machine is neither convenient nor environmentally friendly, but also very waste disemothan electricity.
And the traditional lampblack machine needs to turn on or off by itself, and also needs to adjust the size of air flow by itself. Such lampblack machine is neither convenient nor environmentally friendly, and it also wastes electricity.