23% of 13 verified Blueair Blue Pure 211i Maxowners don't recommend it, and 1 describe specific problems — based on real owner comments from Reddit, enthusiast forums, and YouTube.
For balance: 69% recommend it. This page collects the complaints so you know what you're signing up for — read the full owner report for both sides. How we score
“Ours stopped just over 12 months. It's not worth it! It was too expensive. Not commercial grade.”— @elcidlord on YouTube
“I bought a Blueair Blue Pure 211i Max and I've not been able to get it working with HA.”— monkifan on Reddit
“I had the Coways for 4 years, then switched to the expensive Blueair Blue Pure 211i MAX, which I have stuck with for the past nearly two years (I also bought their predecessor although I forget the model name). Don't make the same expensive mistake I did. The Blueair units suck, plain and simple. They have a very loud fan whir and rattle along with motor hum”— jimmyluo on Reddit
“It was the BlueAir Blue Pure 211i Max: https://www.blueair.com/us/air-purifiers/blue-pure-211i-max/3541.html If you look at /u/Intelligent-Prune850's comment, I think they're right that it doesn't have anything to do with the PSU or wiring in the wall, but rather maybe having to do with the purifier emitting ions and my computer's intake being very close to”— krathalan on Reddit
“Blue Air’s advertising is slimy. To say that the light carbon dusting inside of the filter is effective for smoke or odors is a blatant lie. My unit faintly smelled like an old wet campfire.”— @keithcharles2113 on YouTube
Not complaints — practical notes from owners that didn't affect the score.
“So I have had the Blueair Blue Pure 211i Max since late November. I am pretty confident that when viewing the air quality history of the purifier’s indoor PM sensor, the grey line indicates the equivalent outdoor air quality for the location (using Breezometer) you’ve assigned the purifier to.”— DesignerStud on Reddit
“It has an ionizer?! Kinda messed up that they don't make that clear anywhere besides buried in some blog post on their site. I've had this thing for over a year”— neuber on Slickdeals
“The Blueair is a bit different, since the filter basically sits on the outer perimeter of the unit and all around it, with just a fabric covering over the filter. If you pick it up around the sides, you're just feeling the filter, right? Which is going to feel less substantial than the framework of a more traditionally built unit, where the filter sits insid”— Beth_33 on Reddit