Air purifier can grow again during the promotion period when the overall market situation is not optimistic. The main reason is that the air purifier products are strengthening the properties other than haze, such as formaldehyde.
The biggest change of fresh air system is to use the external circulation mode to continuously extract fresh air from the external environment. After multiple filtration, harmful substances such as PM2.5 are removed...
After the new house is decorated, people usually keep the new house well ventilated for a period of time and even remove formaldehyde, dust, odor and other decoration pollution...