Explained: This is how the unique filter system of the AiroDoctor works
The unique four stage filter system of the AiroDoctor air purifier covers an unusually broad spectrum: 99.9% of all germs, chemicals, pollutants and fine dust particles are adsorbed by the AiroDoctor from the room air and decomposed and neutralized. Each of the filter layers connected in series has its own special function. The "mesh size" of the filters decreases with each layer, and in addition to purely mechanical filtering, chemical reactions finally help in the purification process. In this way, harmful gases, viruses, bacteria and unpleasant odors can be decomposed and neutralized without leaving any harmful residues!
The coarsest filter, the so-called pre-filter, catches everything that is just visible to the naked eye: hair, dust particles, dirt particles and dandruff. This filter must be vacuumed out with a standard vacuum cleaner and washed under water at intervals of several weeks. Replacement is necessary after half a year in use at the earliest.
2. HEPA filter H13
Smaller particles that are no longer visible are then taken care of by the HEPA, the High Efficiency Particulate Air Filter. This HEPA filter removes particles with a diameter between 0.3µm and 2.5µm from the air, for example viruses and bacteria, pollen and mite excrement as well as mold spores and gases. The particles get caught in the densely interwoven glass fiber mats, whose surface area is greatly increased by folding. HEPA are classically used in sensitive spaces such as laboratories, operating rooms and intensive care units. Since the HEPA reaches a saturation level sooner or later, depending on its use, it naturally needs to be cleaned every two months and replaced once a year.
3. Activated carbon filter
Finally, the activated carbon filter offers two different cleaning mechanisms: it, too, can filter out smaller particles purely mechanically. In addition, the carbon acts as a reducing agent via oxidation processes and absorbs and converts harmful gases such as ozone or chlorine. The activated carbon filter is thus the place where unpleasant and harmful odors from cigarettes, excreta or waste are trapped and decomposed. An activated carbon filter can absorb several times its weight in foreign particles, but at the same time it also consumes itself due to the oxidation processes. Therefore, similar to HEPA and depending on usage, the activated carbon filter must be cleaned and replaced at regular intervals.
4. UV LED photocatalytic filter
The last link in the filter chain, on the other hand, has hardly any wear and tear: the innovative UV LED photocatalytic filter. Through a chemical reaction with titanium dioxide (TiO2) triggered by light, it completely decomposes harmful gases, bacteria and viruses, among other things. This includes individual unbound viruses such as influenza or SARS-CoV-2, which, with a diameter of a good 0.1µm, are only half the size of a fine dust particle.
Unique for an air purifier is the fact that the photocatalytic filter is not only coated with the nanoparticles, but consists of 250 grams of solid titanium dioxide. This makes it the only filter of its kind, and its large surface effect makes it particularly low-wearing and durable.