The four-stage Fellowes AeraMax DX55 Air Purifier has a True HEPA Filter, which cleans air by capturing 99.97 percent of particles as small as 0.3 microns. This innovative device includes an AeraSmart Sensor, which adjusts the fan speed automatically and monitors the quality of the air. Light indicators inform you when to change your Carbon and True HEPA filter, whilst the Aera Plus Mode increases air flor for ten minutes during peak seasons. . Recommended for rooms up to 18m2 . 4-stage purification system captures 99.97% of airborne particles as small as 0.3 microns, including pollen and other allergens, dust mites, mould spores, pet dander and cigarette smoke. AeraSafe Antimicrobial Treatment - built-in protection from the growth of odour causing bacteria, mildew and fungi on True HEPA filter. AeraSmart Sensor monitors the air quality and automatically adjusts the fan speed to keep your air purified. Blue, amber and red lights indicate the purity of your air. Aera Plus Mode is designed for peak allergy conditions and increases air flow by around 50 percent to remove allergens from your air. Filter Change Indicators let you know when it is time to replace your Carbon and True HEPA filters. Approx. Dimensions (mm) H 520 W 330* Please note that this product is shipped direct from our supplier and may take longer to arrive