Very positive: high air flow even at the smallest setting of 3 different power levels (with fitness at the highest level recommended for larger spaces than the manufacturer). The filter size is indicative of long-term use. The noise level is a little too high, even at the lowest level. As a suggestion I can therefore propose an even lower power level than actually set (eg for reduced night-time operation). Compared to many other, often much more expensive devices in the market that are advertised with a medical background (but not work otherwise), represents the unit adequate, in my view price range and a total recommended decision. On the positive side I must also assess that is dispensed not unproblematic from a hygienic point of view the production of ozone by ultraviolet lamps and a scientifically undisputed, alleged ionization of the indoor air, which is advertised to other device manufacturers here.
