Austin Air B405C1 Allergy Machine Air Purifier, Medical Grade HEPA Filter, Clinically Proven for Asthma Relief, Removes Allergens, Dust, Pollen, and Mold, White Designed to offer protection for people with asthma and allergies to dust, pollen and other airborne allergens The only air purifier that is clinically proven to remove allergens from the home and dramatically reduce hospital visits for young asthmatic children True medical grade HEPA filter removes 99.97% of all particles larger than 0.3 microns; HEGA (High Efficiency Gas Arrestance) carbon cloth provides an extremely large surface area for adsorption of chemicals, gases, viruses and bacteria 3 speed settings for fan; 360 degree intake system draws air into all sides of unit, passing air through a 4 stage filter Reduces night time allergies, asthma attacks, snoring, and helps you sleep better; eases coughing, wheezing, sneezing; reduces dry mouth, runny nose; strengthens the immune system