With the H.i.-Air purifier Silent Air S , the air quality in medical, public, commercial and private buildings can be improved in a targeted manner. The filtration takes place via a three-stage filter system, which consists of a pre-filter, a HEPA filter (H14) and a switchable UV-C lamp. Optionally, the device can be equipped with an activated carbon mat or with a larger activated carbon cell and a downstream HEPA filter to remove odors from the room air. Particularly pleasing: the air purifier is characterized by its extremely smooth running and therefore does not cause any annoying noises.