I now find it about 3 weeks of usage and I can really improve the air in my office. Purely subjective? No also quite objectively, since I the Philips air purifier AC4012 / 10 benütze I have far less headaches than before (about 2-3 times a week) and I have to blow his nose also noticeably less in my office.
The device is relatively inconspicuous to accommodate with a height of about 52 cm, a width of about 34 cm and a depth of about 20 cm, at least in offices. Especially since the cable with about 2.3 meters in length enables a sufficient Aufstellradius.
Far less inconspicuous, however, the maximum noise level, but which is also present in normal operation and is given by Philips with incredible 54 dB. Personally, I came now not quite as loud but in everyday life disturbing. However, there is also a sleep mode, in which the noise is reduced but quite probably the power ... Anyway, also the noise in sleep mode while working, let alone when sleeping is totally annoying.
How good that the device which the device has a timer function for 1, 4 or 8 hours off automatically. So I turn the evening before I leave the office, the power on and set the timer to 8 hours, and then the Bypass annoying operation noises. If I am then come back to the office waiting for me then clean air. Likewise, I let the machine during lunch breaks or meetings run outside.
CONCLUSION:
To clean the air in larger rooms (my office has about 35 square meters) or smaller apartments of Philips air purifier AC4012 / 10 is well suited. He is to accommodate relatively inconspicuous due to its dimensions and offers an easy and intuitive handling / operation.
Only the high operating noise is so distracting that you can use the device permanently only in the absence / want, then what ultimately leads to a star deduction.