The AeraMax Professional AM4 air purifier cleans air in 60 - 110 square metre common areas such as schools, offices, waiting rooms, restrooms, and other areas of high concentrations of contaminants. True HEPA filter captures 99.97% of airborne contaminants including viruses and allergens. Activated carbon filter reduces odours and VOCs (volatile organic compounds). Patented EnviroSmart™ technology detects the environment and automatically optimises performance.