After much hesitation, I finally opt for this model seems a good price / quality especially with not too expensive option compared to competitive filters (HEPA and 4 to 32 carbon flitres 30 coupon on Amazon, so I bought into feed set) The maxi fashion is downright noisy but not often need to be activated or longer and helps deodorize a room very quickly. Mini mode when at it's inaudible during the day, by cons if you want to sleep in the same room, it will expect a discrete fan noise remains audible in full silence. During the first days of use, the camera gives off a faint smell of new plastic (unless it is new Filterregulators) that disappears in less than 1 week. To test the sensitivity of the sensors simply to spray any aerosol in the room or the instrument (deodorant, hairspray etc ...) to see it turn orange or red in seconds. In the radius of the sights you can also drink a cognac close, ethanol was quickly recognized and reacted sensor; o) The room air is surprisingly fresh and light, odors are filtered. The "PlasmaTrue" function (: ionization without ozone emission, obviously certified by a recognized organization in the US, but they do not seem too communicate on it with Fellowes which is a shame, we loved aurtait know any clarity what rates 'minimal even ozone is actually released into the air, then on their US site they just say it is a harmless rates by certification blah ... and that's all ...) is disengaged leaving her finger on the button 5 seconds to note that when this thing is on a whistle-type electrical resistance fine is audible (dzziiiii) if one has the ear on the device, 2 meters we do not hear. One can orient the air outlet by simply moving up and down the grid. Not being allergic or asthmatic I can not judge of any effect, except that since I use it I like having the less irritated nose, and it's fun coming home in a lighter air. The electric wire does not comprote ground connection is a simple 2 flat pin plug, length is sufficient. We change the Filterregulators easily by unclipping the side drawer. The design is simple enough to fit nicely around without shocking. There is no way to turn off the LEDs for the night, it will cover if interfere. I chose the largest model and I do not regret it because it allows to treat the air very quickly and efficiently, becomes a living breathing enfummé in minutes if you put the fan thoroughly.