Different power air purifiers apply to the area different, if the room is large, the air purifier whose unit time purifies the air volume should be selected. Under normal circumstances, the 25-square-meter room is suitable for purifiers with a rated air volume of 200 cubic meters / hour, and the rooms of about 50 square meters should be selected from 400 cubic meters per hour of the purifier. Each product will have this parameter, so you must be optimistic before purchasing.