Air Purifier LR500Air cleaning using a three layer filter system (pre filter + activated carbon filter + HEPA filter): domestic dust, animal hair, odours, pollen, various bacteria and viruses as well as harmful gases are filtered out of the air Tests show that a three layer filter system with HEPA H13 filter1) filters out at least 95% of particles with a size of 0. 02 m (viruses generally have a size of 0. 02 0. 3 m). 2)3) For particles 0. 3 m in size, the filter