How does Gree air conditioner purify the air and ventilate?

The "Health/Energy Saving" key is two buttons. Click the health button on the left to display health, then press ventilation display, then press health ventilation display, and then press cancel again. If it is a universal remote control, press the "Health" button to switch to the normal mode. If it is a special type of remote controller, such as MengMeng Bao and MengMeng Kang, there is a special ventilation button, which can be pressed to switch to the ventilation off mode.