Blueair Blue Pure Max: Which Size Clears Your Large Room Fast and Quietly?
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The short answer: The Blue Pure 211i Max is the top pick for a large room: its 435 CFM CADR and 674 sq ft coverage clear the most air per minute here, and at $349.99 it sits at its 90-day low. If your room is closer to 500 sq ft, the 311i+ Max saves $95 with 339 CFM, and the 311i Max saves $120 at 283 CFM.
- Best overall: Blue Pure 211i Max — Highest airflow in the family at 435 CFM and 674 sq ft coverage, yet runs at 23 dB on low and is at its $349.99 90-day low. See price at blueair.com
- Best value: Blue Pure 311i+ Max — 339 CFM and 525 sq ft coverage for $254.99, $95 less than the 211i Max, with the same 23 dB low setting. See price at blueair.com
- Best compact: Blue Pure 311i Max — 283 CFM and 439 sq ft coverage in a 7.8 lb, 19-inch body at $229.99, $120 below the 211i Max. See price at blueair.com
- Best for small rooms: Blue Pure 411i+ Max — 167 CFM and 259 sq ft coverage at 19 dB, the quietest low setting listed, for $135.99 at its 90-day low. See price at blueair.com
What changed: The 411i+ Max has fallen to its $135.99 90-day low, and every other model in the family is also sitting at its 90-day low.
| Product | cadr | coverage sqft | noise db | dimensions | weight | Price now | 90-day low | Rating | |
|---|---|---|---|---|---|---|---|---|---|
| Blue Pure 211i Max | 435 CFM | 674 sq ft | 23 dB | 22.7 x 14.4 x 14.4 | 16.2 lb | $349.99 | $349.99 | 4.6 | blueair.com |
| Blue Pure 311i Max | 283 CFM | 439 sq ft | 23 dB | 19 x 12.5 x 12.5 | 7.8 lb | $229.99 | $229.99 | 4.6 | blueair.com |
| Blue Pure 311i+ Max | 339 CFM | 525 sq ft | 23 dB | 21 x 12.5 x 12.5 | 7.9 lb | $254.99 | $239.99 | 4.6 | blueair.com |
| Blue Pure 411i+ Max | 167 CFM | 259 sq ft | 19 dB | 18.9” x 10.6” x 10.6” | — | $135.99 | $135.99 | — | blueair.com |
| Blue Pure 511 | 122 CFM | 189 sq ft | 24 dB | 13.4” x 7.9” x 7.9” | 4.2 lb | $99.99 | $99.99 | 4.2 | blueair.com |
| Blue Pure 511i Max | 153 CFM | 237 sq ft | 19 dB | 14.5” x 9.3” x 9.3” | 4.2 lb | $139.99 | $139.99 | 4.6 | blueair.com |
Blue Pure 211i Max
Pros
- 435 CFM CADR is the highest in the lineup, for fast clearing of large rooms
- 674 sq ft coverage is the largest listed
- Runs at 23 dB on low for quiet operation
- At $349.99 it is at its 90-day low, flat pricing
Cons
- Priciest of the group, $120 more than the 311i Max and $250 more than the 511
- 16.2 lb and 22.7 inches tall, the heaviest and bulkiest listed
Who it's for: Anyone needing maximum airflow and coverage for a large room who will pay more and has floor space for a bigger unit.
Blue Pure 311i Max
Pros
- 283 CFM CADR and 439 sq ft coverage for mid-size rooms
- Runs at 23 dB on low, matching the quietest units in the lineup
- Light at 7.8 lb and compact at 19 x 12.5 x 12.5 in
- Rated 4.6 and priced at its 90-day low of $229.99
Cons
- Costs $25.00 less than the 311i+ Max, which offers higher 339 CFM CADR and 525 sq ft coverage
- Lower 283 CFM airflow than the 211i Max's 435 CFM, so it clears large rooms less quickly
Who it's for: Buyers who want solid mid-size-room cleaning with very quiet low-speed operation at a lower price than the higher-airflow Max models.
Blue Pure 311i+ Max
Pros
- 339 CFM CADR and 525 sq ft coverage clear a large room quickly
- Runs at 23 dB on low, so it stays quiet while you sleep or work
- Weighs just 7.9 lb, easy to move between rooms
- Rated 4.6 by users
Cons
- Current $254.99 is above its $239.99 90-day low
- Costs $25 more than the Blue Pure 311i Max, which covers less area
Who it's for: Anyone who wants strong large-room airflow in a light, quiet unit without stepping up to the bigger 211i Max.
Blue Pure 411i+ Max
Pros
- 19 dB operation is the quietest in the lineup
- CADR of 167 CFM covers rooms up to 259 sq ft
- Current $135.99 is at its 90-day low, down from a $144.49 high
- Compact 10.6-inch footprint fits tight spaces
Cons
- 167 CFM is the second-lowest airflow here, well below the 211i Max's 435 CFM
- 259 sq ft coverage is modest for large rooms
Who it's for: Buyers with a small-to-medium room who want very quiet operation at a low price.
Blue Pure 511
Blue Pure 511i Max
How we chose
We started with airflow, since that is what clears a large room quickly. The Blue Pure 211i Max is rated at 435 CFM and 674 sq ft, the highest CADR and coverage in the family. The 311i+ Max is rated at 339 CFM and 525 sq ft, and the 311i Max at 283 CFM and 439 sq ft. The smaller units step down from there: the 411i+ Max at 167 CFM and 259 sq ft, the 511i Max at 153 CFM and 237 sq ft, and the 511 at 122 CFM and 189 sq ft.
Quiet operation on low mattered too. The 211i Max, 311i Max and 311i+ Max are all listed at 23 dB; the 411i+ Max and 511i Max at 19 dB; the 511 at 24 dB. We also weighed size and weight, from the 22.7 x 14.4 x 14.4-inch, 16.2 lb 211i Max down to the 4.2 lb 511 and 511i Max.
On current price, the 211i Max is $349.99 and sits at its 90-day low. The 311i+ Max is $254.99, $95.00 less, and the 311i Max is $229.99, $120.00 less. The 511i Max is $139.99, the 411i+ Max $135.99 at its 90-day low, and the 511 $99.99.
Who should skip these
If your room is small, the 211i Max is more purifier than you need. The 511 covers 189 sq ft at $99.99, and the 511i Max covers 237 sq ft at $139.99. The 211i Max costs $250.00 more than the 511 and $210.00 more than the 511i Max, and both smaller units sit at their 90-day low.
The 411i+ Max is another step down in size, at 259 sq ft of coverage and $135.99. It costs $214.00 less than the 211i Max, and its price is at its 90-day low within a 90-day range of $135.99 to $144.49.
If you need more than 674 sq ft of coverage, this family won't get you there. The 211i Max is the largest unit here at 674 sq ft and 435 CFM, so a bigger space calls for something outside this series.
How to choose the right one
Start with the room, not the price. The Blue Pure 211i Max is rated at 435 CFM and 674 sq ft, the Blue Pure 311i+ Max at 339 CFM and 525 sq ft, and the Blue Pure 311i Max at 283 CFM and 439 sq ft. If your room is near the top of that range, the 211i Max moves the most air per minute of the three. If it is closer to 500 sq ft, the 311i+ Max covers it on paper.
Then weigh the step-ups. The 211i Max costs $95.00 more than the 311i+ Max, and the 311i+ Max costs $25.00 more than the 311i Max. The 211i Max costs $120.00 more than the 311i Max. Each step buys more CADR and more coverage, so the question is how quickly you want a large room cleared.
All three run at 23 dB on low. The 211i Max weighs 16.2 lb; the 311i+ Max and 311i Max weigh 7.9 lb and 7.8 lb. The 211i Max is at its 90-day low of $349.99, the 311i Max at its 90-day low of $229.99, and the 311i+ Max is $254.99 against a 90-day low of $239.99.
Questions readers ask
Which model clears a large room fastest?
The Blue Pure 211i Max has the highest airflow at 435 CFM and covers up to 674 sq ft, the largest in the family.
Which models run quietly on low?
The 211i Max, 311i Max and 311i+ Max all run at 23 dB, while the 411i+ Max and 511i Max go down to 19 dB.
How much more does the 211i Max cost than the 311i Max?
The 211i Max costs $120.00 more than the 311i Max, and $95.00 more than the 311i+ Max.
What is the most affordable option?
The Blue Pure 511 is $99.99, and the 511i Max is $40.00 more at $139.99.
Has the price of the 311i+ Max changed?
Its 90-day range runs from a low of $239.99 to a high of $254.99, and it currently sits at $254.99.
Update history
- — The 411i+ Max has fallen to its $135.99 90-day low, and every other model in the family is also sitting at its 90-day low.
- — The 311i+ Max and 411i+ Max are both at 90-day lows after falling from $254.99 and $144.49 respectively.
- — Prices and availability refreshed
- — First published
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