Bests & Worsts Reviews from Amazon

So far this air filter has done well to perform its job. I am using it continually in a 15'x10' bedroom with a single window which opens to a busy street. The dust levels are wholly unmanageable due to the road. I cleaned thoroughly and have been running this filter 24/7 since it arrived. The noise levels are as expected. Low is a whisper, even at night when I want quiet to sleep. Medium is low level white noise which helps cover up city noise. High is a fairly loud fan. The unit is shorter than the images make you think. I actually ended up putting it on my desk in the corner. If you need a better image in your mind, check out the specifications. They include the dimensions. Just be warned that the picture shown is a low angle macro shot which totally messes up the perspective. It is smaller than you think from the picture. The charcoal filter in the back is already clearly dirty. The HEPA filter is not yet visibly tainted. In my grossly dusty location, I expect this filter to last perhaps a month or two at a time. I am in San Diego surrounded by dust, brake residue, smog, cigarette smoke, humid moldy air, endless pollen, endless everything... I sweep up a dustpan worth of crap off my hardwood floors twice a day, every day. I am sure that this will help, but I bet it would help more to simply hermetically seal my entire house. Final thoughts. This does UV, which will only be useful if the airflow is very low. Generally UV sterilization is done for 15 min (I work in a lab and am a scientist), this means that a uv light trying to sterilize passing air is a waste of time. But maybe, just maybe, the uv lamp is helpful on the low airflow setting. This filter does NOT produce any kind of ionization. Don't buy snake oil, and don't buy ionizers. They produce ozone which is a known surface disinfectant, including the single cell layer of the inside of your lungs. You want those cells in your lungs to die? Well that's what happens when you breath ozone! That's why we keep it way up high in the atmosphere and not down here in the breathin' air. Ozone generators will make your asthma/copd/emphysema much worse. As an FYI to anyone interested. I am severely asthmatic, that's why I have this. The filter seems to help reduce symptoms, but I am forced to run the AC to keep the room cool and not let more dust in through the windows. Without the windows, the room heats up to 100+degrees even at night. None of which is the fault of the filter... this has just been an anecdote. If you want to reduce your severe asthma, move to a foggy costal area with temperatures between 45F and 70F. That's that kept me alive most of my life. This advice also has nothing to do with the filter... it too has just been an anecdote.