Advanced Design, Multi Room Coverage The Alto four was created from a Swedish desire to bring clean air to the modern world. The included long life filter set will last for a whole year. Buy an EVA air purifier and you will receive trouble free, clean air, for years to come. Elegant and easy to Use Simply select auto mode on the touch control panel and the professional-grade PM2.5 particulate sensor will monitor the air quality, adjusting the fan speed automatically when a change in air particles is detected. The display shows an air quality reading and the colour will change to reflect your environment - blue (perfect), green (normal), purple (poor), red (high risk). Eliminate Bad Bacteria and Viruses The Alto four has been designed with high density activated carbon and true HEPA filters. These remove 99.95% of airborne bacteria and viruses within one hour. High Density Activated Carbon Filters EVA filters only use high density activated carbon making them up to 90% more efficient at removing VOC's and toxic gases such as those given off by cleaning products. Quieter than a Whisper EVA air purifiers have the lowest decibel ratings on the market, the Alto four produces just 17dB in silent mode. At night the auto mode will react to darkness by dimming all lights and switching to silent mode. Allergy and Asthmatic Protection Many modern industrial processes and materials can cause our immune systems to become over-sensitive. The Alto four constantly removes 99.97% of allergen risks. Pollution, a thing of the past Open a door, window or use a gas cooker in your kitchen and your home can fill with pollution. Your EVA air purifier will remove these damaging particles to let you breathe easy. Using Chemicals to Hide Odours? Nobody likes odour pollution caused by cooking, damp, dust, pets or smoke. With an EVA air purifier, you can significantly reduce these odours, lock them away forever and use less chemicals.