Blueair - Blue Pure 211i Max
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Based on 1 year's data from Feb 24, 2026 How it works
Liked most:
15
0
"it's fantastic in keeping the farm smell to a minimum."
"it’s majorly helped w allergies and dog smell"
"No more nasty dog smell in our bedroom."
30
1
"also excellent for smoke—I live in an area often affected by wild fires"
"it’s majorly helped w allergies and dog smell"
"has substantially lessened my seasonal allergy symptoms while in the house"
6
0
"They're incredible and the best thing is that they have this washable cloth sleeve (pre filter) that goes over the entire intake which happens to wrap all the way around. ... It does such a good job that the actual internal filter stays significantly cleaner and doesn't need to be cleaned or changed as often. ... It's a game changer."
"It does an amazing job of capturing cat fur. ... I have to wash it every two weeks due to how much fur and hair it catches."
"Blueair imo because they have washable prefilters, and pet hair and dander is large and honestly doesn't need HEPA filters to clear it out the way, say, smoke does."
16
2
"it’s majorly helped w allergies and dog smell"
"has substantially lessened my seasonal allergy symptoms while in the house"
"Super noticeable difference ... even just the fabric pre-filters catch a lot and their appearance varies from room to room (ex. dust in the bedroom, cooking oils in the kitchen) which leads me to believe they’re working!"
10
0
"the only ones whose fans have stayed smooth and quiet. ... i have owned 8 over 5-6 years at least without one single issue."
"the BlueAirs are the only ones whose fans have stayed smooth and quiet."
"Dead silent on the first setting"
Disliked most:
4
5
"OTOH, the two Blueair purifiers are on all the time and we have ***not*** noticed a decrease in the rate at which dust accumulates on the woodwork in the house."
"the auto setting barely did anything unless I literally blew smoke at them"
"Maalikabok pa rin kahit super sealed yung unit."
1
3
"the larger sizes have significantly more expensive filters"
"Those filters are crazy expensive, so that purchase turned into quite the "investment"."
"BlueAir is ok but the filters are small and replace more often."
1
1
"I don’t like they have an ionizer that you can’t disable. ... Ionizers create ozone, and when ozone reacts with different molecules it creates all kinds of new compounds that can’t be predicted."
0
1
"It's still not providing 4-5 air changes an hour to 3,000 square feet ... It's common for air purifier manufacturers to mislead on square footage coverage. The 3,000 square foot is likely based on one air change an hour. That won't be enough for someone wanting a purifier to help with allergies, viral load reduction, dust reduction, etc. ... The Blue Air website recommends 635 square feet for 4 air changes in an hour. ... The 635 square feet assumes the device will be ran on the highest fan speed to achieve the 4 air changes an hour. ... After doing some deeper digging I learned not to trust the advertised square footage. Even some big name publications are just trusting manufacturer claims and are not doing their own testing to verify. Members of this forum like myself try to educate people that we can't always trust the advertised square footage. ... It's unfortunate we can't always trust the advertising. I wish manufacturers would give a straightforward number on air changes you can expect in an hour within a certain square footage and ceiling height. For ex: 4 air changes an hour in 500 square feet 1 air change an hour in 2,000 square feet"
almondface 1.0I have a blueair 211i and 2 311is and I love them. I have noticed a significant decrease in dust and allergy symptoms. I recommend getting at least one for the bedroom and one big one for any open areas.
bertles86 1.0Blueair.com, Swedish, excellent products.
derausgewanderte 1.0I also have two blue air purifiers for large rooms. 2 story house. Blue Pure 211i Max Some limited information through the HA integration. There purifiers were rated top at consumer reports and we are very happy with them. No more nasty dog smell in our bedroom.
epchilasi 1.0I googled the tests CBC marketplace did on this quickly. The BlueAir **significantly** outperformed a single furnace filter (about 2.5x better) and all other tested brands. Single furnace filter was twice as effective as Dyson. [Source.](https://www.cbc.ca/news/business/portable-air-purifier-tests-marketplace-1.5900782) Furnace filter will probably work great. Don't waste money on a dyson. BlueAir is HQed in Sweden. It is owned by UniLever, which is HQed in the UK. So, BlueAir is at least not American.
Only some blue air models have ionizers. ~~Most/the most common ones do not.~~ The CADR for the 211i max (which I only pick because I have) does not have an ionizer and still rates ~4x a single Merv 11 filter on a box fan. I still think the Merv on a box fan is great. I only use BlueAir because I know it's effective while also being pretty. I also like the pre-filter for pet hair. Edit: I have learned that it apparently does have an ionizer, but, it's CARB compliant and has passed many other tests that certify it's not producing ozone in any amount that could possibly be dangerous. I think people just want to dunk on it (and use words like ionizing [which we should be concerned about] with no nuance) because they're expensive. But it still works very well and is safe.
Far_Resource_8965 1.0Blue air. My wife suffers of airborne allergies, and these air purifiers practically eliminated her allergy episodes at home. We know they worked since a couple of times we have tried generic filter replacements and my wife allergies were back, but disappear again as soon as we bought the original brand name filter replacement.
We have the Blue pure 511 for our bedroom and the Blue pure 211i Max for of living room-kitchen (open concept).
hypersug 1.0Most will be loud, on full speed and most will have only 3 speeds. You want one with variable speeds, using a slider in the app. My BlueAir 211i Max does it.
IamoneofScottsTots 1.0We have the 211 Max and we also have the classic 405. I have a tiny 411 in my office.
Midwest-Dad99 1.0We have the 211i Max and are happy with it.
monkifan 1.0I have a Blueair Blue Pure 211i Max and wouldn't necessarily recommend it. The PM sensors frequently don't update (both in HA and the BlueAir app) even though it shows on the purifiers display. The integration provided via HACS also behaves a little oddly with my model at least - if I turn on the purifier using a dashboard toggle, it overrides the purifier mode to manual and sets the fan to 50%. A previous integration (unfortunately no longer supported) left all the settings as-is when I turned it off/on.
No-Vanilla-3585 1.0Same. I can’t believe I went along with my old crappy one for so long. I have had mine for a few months and love it.
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