Envion Ionic Pro 90IP01TA01W Turbo Ionic Air Purifier for Large Rooms up to 500 sq ft - HEPA Filter, Quiet Operation, Black - Perfect for Bedrooms, Living Rooms & Offices

Experience: I bought this unit in 2020 and have used it off and on for about a year and a half now. Since it has no fan, it's great for leaving on all day without making noise — but it doesn't move very much air, which means it might not be great for a large area. I haven't had to deal with obvious smells, dust, or smoke yet, so I can't rate its effectiveness very well, other than that it does definitely capture airborne dust.Features: It has “high, medium, low” modes, but since it's so quiet, I can't see why you'd want to use the medium or low settings. (The blue LEDs are annoyingly bright, but a LightDims darkening sticker fixed that.) Popping out the collection blade unit to clean is easy. The one thing I wish it had was a timer, to automatically turn off at night. You can't put it on a plug-in timer because it resets to “off” when power is lost.It doesn't make any fan noise, but there is a very slight static crackling sound if I put my ear up to it, which I can't hear at all from farther away, though I'm in an apartment with a fair bit of outside noise so perhaps in a truly quiet space it would be more obtrusive. (As the instructions say, if it makes louder crackling noises, it needs cleaning.)I'm slightly concerned that the collection blades are showing a couple rust spots on one edge, but I don't know whether that would affect the effectiveness if they got rustier.