The Venta Humidifier acts as a two in one humidifier/purifier. The Venta humidifier is more effective than air purifiers alone. The Venta Air washer humidifies the air while simultaneously drawing in and removing dust, pollen and other contaminating particles down to 10 microns (10/1000 mm) in size from the air. It is an ideal product for removing unpleasant odors, dust, pet dander, and even pollen.