You have to place the air purifier in the room where air can circulate freely both in and out. And there should be ample free space around the unit, away from furniture, walls and other objects that can interact with air flow. Below are some of the recommendation of placing an air purifier… *Avoid placing in corners as the walls will interrupt the air flow. *You have to place it at least 10 cm/4 inches far from obstacles like wall, furniture or others. *It is better to place the air purifier close to pollution source.