Blueair · Most clean air
Blueair Blue Pure 211i Max
The most clean air on this list: 435 cfm of smoke CADR by Blueair's current rating, from 23 dB on low, with a washable fabric pre-filter.
- 435 cfm smoke CADR
- Draws air from all sides
$349.99at blueair.com · Nov 2026
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- smoke CADR: clean air it moves each minute
- 435 cfm
- room size it suits, every day
- 63 m²
- 674 ft²
- room size on smoggy days
- 40 m²
- 435 ft²
Blueair Blue Pure 211i Max at a glance
- Smoke CADR
- 435 cfm (Blueair's current US rating)
- Filter
- Washable fabric pre-filter, HEPASilent filter with carbon
- Noise (maker)
- 23–53 dB
- Smart features
- Blueair app, auto mode, Alexa and Google
- Intake
- 360°, so it can stand anywhere in the room
Which rooms it suits
Everyday: AHAM's room size. Smog: AHAM's advice for smoke, a CADR at least equal to the floor area in ft².
| Room | Everyday | Smog days |
|---|---|---|
| Bedroom · 15 m² (161 ft²) | ||
| Living room · 30 m² (323 ft²) | ||
| Large room · 50 m² (538 ft²) |
Our take
The 211i Max moves more clean air than anything else here: 435 cfm of smoke CADR, enough for a room of about 63 m². It pulls air in all the way round, so placement matters less, and its fabric pre-filter comes off for washing.
It's still quiet on low, which makes it one of the few big purifiers that can share a room with people all day.
Older listings show 410 cfm. Blueair re-rated it to 435 under the new US test method.
What's good
- Clears about 40 m² on a smoky day
- About 63 m² day to day
- Draws air in from all sides, so it can stand anywhere
- From 23 dB on its lowest setting
What's not
- Its CADR is Blueair's own rating, not an AHAM test
- Premium price
Replacement filter: Blueair Blue Pure 211i Max replacement filterFind it on Amazon(opens in a new tab)
Good for
- Large living rooms up to about 63 m²
- The single strongest purifier here for a smoggy main room
Skip it if
- It's for a bedroom: most of its capacity would go unused
How it compares
Every air purifier in the shop.
| Product | Best for | Smoke CADR | Room size | Price |
|---|---|---|---|---|
| Levoit Core 300S | Smart bedroom | 141 cfm | 20 m² | $149.99 |
| Levoit Core 300 | Budget bedroom | 143 cfm | 21 m² | $89.99 |
| Levoit Vital 100S | Pet-friendly bedroom | 143 cfm | 21 m² | $119.99 |
| Coway Airmega 150 | Small & quiet | 153 cfm | 22 m² | $189.99 |
| Levoit Core 400S | Shows PM2.5 | 231 cfm | 33 m² | $189.99 |
| Winix C545 | Everyday pick | 232 cfm | 33 m² | $209.99 |
| Coway Airmega AP-1512HH Mighty | Best overall | 233 cfm | 34 m² | $239.99 |
| Coway Airmega AP-1512HHS (Mighty with Wi-Fi) | Smart Mighty | 233 cfm | 34 m² | $299.99 |
| Coway Airmega 200M | Mighty's twin | 233 cfm | 34 m² | $229.99 |
| Levoit Vital 200S | Pet homes | 250 cfm | 36 m² | $169.99 |
| Honeywell HPA300 | No-frills power | 300 cfm | 43 m² | $269.95 |
| Coway Airmega 400 | Big rooms | 376 cfm | 54 m² | $649.00 |
| Levoit Core 600S | Large rooms | 391 cfm | 56 m² | $299.99 |
| Blueair Blue Pure 211i Max (this one) | Most clean air | 435 cfm | 63 m² | $349.99 |
| Filtrete MPR 1900 MERV 13 filters for a DIY box-fan purifier (4-pack) | Budget build | — | — | $87.99 |
In our buying guides
- 1Best air purifiers for wildfire smoke and smog
- 1Best air purifiers for large rooms and open-plan spaces
- 4Best air purifiers for pet hair and dander
- 4Best air purifiers for allergies and asthma triggers
- 5Best smart air purifiers with Wi-Fi and app control
- 4Best air purifiers in the UAE for dust and sandstorms
Head to head
Questions about the Blue Pure 211i Max
- What size room does the Blueair Blue Pure 211i Max cover?
- About 674 ft² (63 m²). That's AHAM's room size for its smoke CADR of 435 cfm: the floor area, with an 8 ft ceiling, whose air it cleans about every 12.5 minutes.
- Is the Blueair Blue Pure 211i Max enough for smog?
- For smoke and heavy smog AHAM suggests a smoke CADR at least equal to the floor area in square feet. By that measure the Blueair Blue Pure 211i Max keeps up with a room of about 435 ft² (40 m²). Keep the windows shut and run it on high while the AQI is bad.
- Why does Blueair say the 211i Max covers about 3,000 ft²?
- That figure is for cleaning the room's air once an hour. At AHAM's standard, about every 12.5 minutes, it suits about 674 ft² (63 m²).
How we judge. We haven't tested the Blue Pure 211i Max in a lab of our own. The figures come from independent ratings (AHAM, Energy Star, NIOSH, the ASPCA) or the maker, and the verdict is ours, from those figures. No brand pays to be listed. Last checked Nov 7, 2026.
Blueair Blue Pure 211i Max
$349.99 list price