Is the Blueair 311i Max worth it?
Room air purifier · suggested up to 439 sq ft · Fabric
Blueair 311i Max on Amazon · $169.99 →Sold by Amazon.com. Affiliate link.
Yes, for a bedroom or office up to 439 sq ft. It cleans more smoke than the Winix T810 and AT40, uses the least power of the three, and cost the least on Amazon.
Blueair Blue Pure 311i Max review
The short answer
Yes. The Blue Pure 311i Max is one of the best buys for a room up to 439 sq ft. AHAM certifies 283 CFM of smoke clearing on only 29.6 watts. That beats the Winix T810 (270) and AT40 (265), and it cost less on Amazon on October 13, 2026 ($169.99 vs $175.99 and $206.36). Filters need changing more often: Blueair says up to 9 months, about $60 a year. Over two years it costs about the same to own as the AT40.
- Blueair 311i Max on Amazon · $169.99 Sold by Amazon.com
- Genuine 311i Max filter · $44.99 Particle + carbon; Blueair says it lasts up to 9 months
- Blueair 211i Max · $244.99 For a bigger room, up to 674 sq ft
Prices on Amazon on the review date; they change often. Affiliate links; we earn a commission at no cost to you.
At a glance
Who it's for
A bedroom, nursery or office up to about 439 sq ft.
The standout number
283 smoke CADR on 29.6 watts. Running all day that is about $49 a year in power, the lowest here.
The catch
Filters: $44.99 each, up to 9 months, about $60 a year. The 311i+ Max is a different machine with a different filter (F3MAX+).
The Verified Label — every AHAM-tested spec
ENERGY STAR listed
US market
Clean Air Delivery Rate (CADR) — source: AHAM
Coverage & power — source: AHAM (+ computed)
Filter & identity
How it ranks
Where this unit sits among the 235 room air purifiers we track, on the two numbers that decide one: how fast it clears fine smoke particles, and how big a room it covers. Percentiles are computed from our corpus (higher = better).
Smoke CADR
Better than 84%
of the 235 units with a published smoke CADR
Suggested room size
Better than 84%
of the 235 units with a published room size
The 311i Max vs two Winix rivals on Amazon
Smoke CADR and room size are AHAM-certified. Quietest setting is the maker's own figure. Filter cost is the maker's genuine filter on Amazon at the longest life each maker states (Blueair up to 9 months, Levoit 6 to 12 months, Winix 12 months), so Blueair's real cost can run higher if you change it sooner. Power cost is running all day on the smoke-test speed at 18.83¢ per kWh. Two-year cost = Amazon price + filters you'd buy + two years of power. The AT40 ships with two filter sets. Amazon prices on October 13, 2026.
| Unit | Smoke CADR | Room (sq ft) | Quietest (dB) | Filter / yr | Power / yr | 2-year cost | Where |
|---|---|---|---|---|---|---|---|
| Blueair Blue Pure 311i MaxThis page | 283 | 439 | 23 | $60 | $49 | $358 | $169.99 on Amazon |
| Winix AT402 filter sets in the box | 265 | 410 | 22 | $50 | $74 | $355 | $206.36 on Amazon |
| Winix T810Filter R, 12 months | 270 | 418 | 23.8 | $75 | $74 | $399 | $175.99 on Amazon |
The 311i Max wins on smoke CADR, price and power. The AT40 is about even on two-year cost ($355 vs $358) because it ships with a second filter. The T810 costs the most to own here ($399).
Sources: AHAM Verifide directory: Blueair 3332111100 (Blue Pure 311i Max), 3432111100 (311i+ Max), Winix AT40, T810 · Blueair: Blue Pure 311i Max product page · Blueair: Blue Pure 311i+ Max product page · Winix: T810 product page · Amazon listing: BLUEAIR Air Purifiers for Home up to 2,107 Ft², Blue 311i Max · Amazon listing: BLUEAIR Genuine Blue Pure 311i Max Air Purifier Replacement Filter · Amazon listing: WINIX AT40 Air Purifier with 2 Years of Filters for Extra Large Room Up to 1968 Ft² in 1 H · Amazon listing: WINIX T810 Air Purifier for Home Extra Large Room Up to 1968 Ft² in 1 Hr With Smart Wi-Fi,
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Frequently asked questions
Is the Blueair 311i Max worth it?
Yes for a room up to 439 sq ft. It certifies 283 smoke CADR on 29.6 W and cost $169.99 on October 13, 2026, less than the Winix T810 or AT40.
Blueair 311i Max vs 311i+ Max: what is the difference?
They are different machines. Blueair rates the 311i+ Max for a bigger room (525 sq ft vs 439) and it is a little taller. It takes a different filter (F3MAX+), and the filters do not swap. AHAM certifies the 311i+ Max at 339 smoke CADR.
Why does Amazon say 2,107 sq ft when you say 439?
2,107 sq ft is a room filtered once an hour. AHAM's 439 sq ft is a room cleaned about 4.8 times an hour. Use 439 sq ft to size it.
How often do you change the Blueair 311i Max filter?
Blueair says up to 9 months. The genuine filter was $44.99 on Amazon on October 13, 2026: about $60 a year at 9 months, $90 at 6.
Is the Blueair 311i Max a HEPA purifier?
Blueair calls its filter HEPASilent: a fabric filter plus an electric charge, not True HEPA. AHAM lists a fabric filter. The certified CADR is what tells you how fast it cleans.
How loud is the Blueair 311i Max?
Blueair lists 23 dB on low and 50 dB on high. Low is quiet enough for a bedroom.
How big a room does the Blueair 3332111100 (Blue Pure 311i Max) cover?
AHAM suggests it for a room up to 439 square feet. That rating assumes it runs on high and cleans the air about 4.8 times an hour. For faster cleaning — say for wildfire smoke or allergies — size it to a smaller room than the maximum.
What is the CADR of the Blueair 3332111100 (Blue Pure 311i Max)?
Its AHAM Clean Air Delivery Rate is 314 for dust, 283 for smoke and 365 for pollen, with a PM2.5 CADR of 298. CADR is cubic feet of clean air delivered per minute — higher clears a room faster.
How much power does the Blueair 3332111100 (Blue Pure 311i Max) use?
About 29.6 watts on its smoke-clearing setting, which works out to 9.6 CADR per watt — a measure of how much clean air you get for the electricity it draws. It is ENERGY STAR certified.
Sources. Clean Air Delivery Rate (dust / smoke / pollen), PM2.5 CADR, suggested room size, ENERGY STAR status and power draw come from the AHAM Verifide air-cleaner directory (the industry's independent CADR test). Average CADR, clean-air-per-watt and the percentile figures are computed by Verified HVAC Data from those published ratings. We publish no star ratings and take no payment for placement. "Not published" means AHAM's record doesn't disclose it — we never fill a spec with a guess.
Blueair 311i Max on Amazon · $169.99 → See how it ranks against every purifier