Air is our Passion EVA was created from a Swedish desire to bring clean air to the modern world. A group of highly specialised engineers work tirelessly to create inspired designs that have a low carbon footprint. High Density Activated Carbon Filters EVA filters only use high density activated carbon, the material that is vital to ensuring the filters last a long time whilst always working at full capacity. This makes them up to 90% more efficient at removing VOC's and toxic gases such as those given off by cleaning products. Protection You Can Trust These filters will remove 99.97% of pollen, mould, smoke, pet dander, dust mites, VOC's and toxic gases along with 99.95% of airborne bacteria and viruses. Always Designed to be Long Life This pack contains everything you need when replacing your EVA Alto four filters. The true HEPA and a high density activated carbon filters included are both long life so they will last for a whole year.