Very Noisy on high. Doesn't seem to work on cigarette smoke that rarely comes in from neighbors. Filter change warning doesn't reflect actual condition of filter, seem to be based on hours on. Windows are closed here mostly, unit is in low use small bedroom, no pets or kids running around, no smoking.

This air purifier improved air quality discernably in our 2-bedroom condo during the recent choking wildfire smoke. Glad we bought it. Very quiet in night mode and acceptable during higher settings. The HEPA filters can be replaced easily however they are still okay after about 100 hours of use in the medium speed setting and with closed windows. The touch controls are neatly integrated and unobtrusive however we would prefer simpler ergonomic buttons or nobs located on the side because it is not easy to find the right setting without numerals or idiot dots. Please redesign the controls to earn 5 stars.

I use these 400 series filters on my BlueAir Classic 405, and I haven't had any problems. Whenever it's time to install a new filter, the old one has a lot of dust and other particles on it. It's especially visible when you compare the old filter next to the new one that you're going to replace it with.

I wanted to get a second one for my filter and it’s perfect. Easy to put on and easy to clean, just throw it in the washer!

Works well, efficient.