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Head to head

Alen BreatheSmart 75i Large Room Air Purifier vs Blueair Blue Pure 311i Max

They split the 4 rankable specs evenly, so cost decides it: Blueair Blue Pure 311i Max costs $520 less.

Catalog as of September 1, 2026

Why, in numbers

  • CADR: Alen BreatheSmart 75i Large Room Air Purifier lists 350 CFM across Smoke, Dust, Pollen (Alen sheet, 2026-09-02); Blueair Blue Pure 311i Max lists 250 CFM (Smoke), 250 CFM (Dust), 250 CFM (Pollen) (Blueair sheet, 2026-09-02).
  • Coverage area: Alen BreatheSmart 75i Large Room Air Purifier lists 1,400 sq ft (2 air changes/hr) / 700 sq ft (4 air changes/hr) (Alen sheet, 2026-09-02); Blueair Blue Pure 311i Max lists 387 sq ft (4.8 air changes/hr) / 929 sq ft (2 air changes/hr) (Blueair sheet, 2026-09-02).
  • Room size: Alen BreatheSmart 75i Large Room Air Purifier lists Large master suites, open living rooms, offices (Alen sheet, 2026-09-02); Blueair Blue Pure 311i Max lists Medium to large bedrooms, living rooms, and open offices up to 387 sq ft (4.8 ACH) / 929 sq ft (2 ACH) (Blueair sheet, 2026-09-02).
  • Filter types: Alen BreatheSmart 75i Large Room Air Purifier lists Medical-grade H13 True HEPA + Antimicrobial layer + Heavy Odor Carbon (Alen sheet, 2026-09-02); Blueair Blue Pure 311i Max lists HEPASilent Main Particle + Carbon filter with customizable machine-washable fabric pre-filter (Blueair sheet, 2026-09-02).
  • Filter life: Alen BreatheSmart 75i Large Room Air Purifier lists 12–15 months extra long filter life (Alen sheet, 2026-09-02); Blueair Blue Pure 311i Max lists 6 to 9 months (tracked by RealTrack algorithm in app) (Blueair sheet, 2026-09-02).

Manufacturer list price, not a live offer. Confirm current pricing before you buy.

Alen BreatheSmart 75i Large Room Air Purifier
$7492 spec wins
Swap

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Blueair Blue Pure 311i Max
$2292 spec wins
Swap

Compare a different air purifier

Levoit Core 300S Smart True HEPA Air Purifier$149Winix 5500-2 Air Purifier$159Levoit Core 400S$219Coway Airmega AP-1512HH Mighty$229Honeywell HPA300 HEPA Air Purifier$249Levoit Core 600S Smart True HEPA$299Blueair Blue Pure 211+ Auto$339Coway Airmega 250$399Coway Airmega 400$549Blueair Protect 7470i$649Dyson Purifier Hot+Cool Formaldehyde HP09$799

Buying for

Every rankable spec counts once. Pick a lens to score only what matters for your air purifier.

Straight answer

Overall: 2 to 2

Tied overall. Blueair Blue Pure 311i Max is cheaper.

  • The 4 rankable overall specs split 2 to 2.
  • Saves $520 at list price.

Check first: the Blueair Blue Pure 311i Max has under 1,000 sq ft coverage.

2 Alen BreatheSmart 75i Large Room Air Purifier4 rankable of 11 specsBlueair Blue Pure 311i Max 2

Deal-breakers

tick what would make you walk away

  • row

    Undersized for an open-plan living area.

    Clear:Alen BreatheSmart 75i Large Room Air Purifier · 1,400 sq ftTrips:Blueair Blue Pure 311i Max · 387 sq ft
  • row

    Hard to move between rooms.

    Trips:Alen BreatheSmart 75i Large Room Air Purifier · 27.0 lbClear:Blueair Blue Pure 311i Max · 7.8 lb

At a glance

The handful of numbers that decide most purchases in this category.

2 of 2 differ

CADR

Alen

350 CFM across Smoke, Dust, Pollen

Blueair

250 CFM (Smoke), 250 CFM (Dust), 250 CFM (Pollen)

Coverage area

Alen

1,400 sq ft (2 air changes/hr) / 700 sq ft (4 air changes/hr)

Blueair

387 sq ft (4.8 air changes/hr) / 929 sq ft (2 air changes/hr)

Alen BreatheSmart 75i Large Room Air Purifier$7492 wins
Blueair Blue Pure 311i Max$2292 wins

Performance

leads 2-0
Performance specifications. Middle column is Alen BreatheSmart 75i Large Room Air Purifier, right column is Blueair Blue Pure 311i Max.
CADR350 CFM across Smoke, Dust, Pollen (wins this row: higher)250 CFM (Smoke), 250 CFM (Dust), 250 CFM (Pollen)
Room sizeLarge master suites, open living rooms, officesMedium to large bedrooms, living rooms, and open offices up to 387 sq ft (4.8 ACH) / 929 sq ft (2 ACH)
Coverage area1,400 sq ft (2 air changes/hr) / 700 sq ft (4 air changes/hr) (wins this row: higher)387 sq ft (4.8 air changes/hr) / 929 sq ft (2 air changes/hr)

Filters

2 differences
Filters specifications. Middle column is Alen BreatheSmart 75i Large Room Air Purifier, right column is Blueair Blue Pure 311i Max.
Filter typesMedical-grade H13 True HEPA + Antimicrobial layer + Heavy Odor CarbonHEPASilent Main Particle + Carbon filter with customizable machine-washable fabric pre-filter
Filter life12–15 months extra long filter life6 to 9 months (tracked by RealTrack algorithm in app)

Usability & Smart

leads 1-0
Usability & Smart specifications. Middle column is Alen BreatheSmart 75i Large Room Air Purifier, right column is Blueair Blue Pure 311i Max.
Noise levels25 dB (WhisperMax) – 49 dB (Turbo speed)23 dB (Night mode) – 50 dB (Max boost) (wins this row: lower)
Energy consumption45 W (Energy Star certified)38 W max power consumption (Energy Star Most Efficient)
Smart featuresAlen Air App (Wi-Fi), auto modes, color ring statusBlueair App (iOS/Android), voice control with Amazon Alexa and Google Assistant, geofencing Welcome Home feature
Air quality sensorsLaser air quality sensor detecting fine particle levels with 5 color ringsLaser particle sensor with 5-color LED air quality indicator ring (PM1, PM2.5, PM10)

Design & Ownership

leads 1-0
Design & Ownership specifications. Middle column is Alen BreatheSmart 75i Large Room Air Purifier, right column is Blueair Blue Pure 311i Max.
Weight27.0 lb (12.2 kg)7.8 lb (3.5 kg) (wins this row: lower)
WarrantyLifetime warranty (with active filter subscription)2 years limited warranty (extendable to 3 years with product registration)
Most rows are from the official spec sheet. Marked rows are other published figures or our summary, not lab tests we ran.
Alen BreatheSmart 75i Large Room Air Purifier source (opens in a new tab)Blueair Blue Pure 311i Max source (opens in a new tab)

Which one should you buy

Pick this one if

Alen BreatheSmart 75i Large Room Air Purifier

Commercial-grade quiet purifier cleaning up to 1,400 sq ft every 30 minutes with a lifetime warranty.

  • Industry-exclusive transferable Lifetime Warranty
  • Tuned pink noise frequencies promote deeper sleep on WhisperMax mode
  • Medical-grade H13 True HEPA filter lasts up to 15 months

What you give up

  • High initial investment
  • Tall tower profile
Full Alen BreatheSmart 75i Large Room Air Purifier specs →

Pick this one if

Blueair Blue Pure 311i Max

Smart air purifier with HEPASilent dual filtration technology, cleaning up to 929 sq ft in 30 minutes, 23dB whisper quiet operation, and Blueair app control.

  • HEPASilent dual filtration combines electrostatic and mechanical filtration for faster airflow at lower noise
  • Cleans up to 387 sq ft in 12.5 minutes (4.8 ACH) / up to 929 sq ft in 30 minutes (2 ACH)
  • Ultra-quiet 23dB Night Mode with Energy Star certified low electricity draw

What you give up

  • Fabric pre-filter covers the exterior and requires periodic vacuuming/washing
  • Filter replacements needed every 6 to 9 months
Full Blueair Blue Pure 311i Max specs →

Best for each use

Bedrooms

Quiet nights: low-speed noise, sleep mode, schedules from your phone

For bedrooms, buy the Blueair Blue Pure 311i Max.

  • Leads 2 of 2 rankable bedrooms specs.
  • Noise levels: 23 dB vs 25 dB
  • Weight: 7.8 lb vs 27.0 lb
  • It is also $520 cheaper.

Big rooms & allergies

Open-plan rooms or allergies: CADR, coverage, filter grade

For big rooms & allergies, buy the Alen BreatheSmart 75i Large Room Air Purifier.

  • Leads 2 of 2 rankable big rooms & allergies specs.
  • CADR: 350 CFM across Smoke, Dust, Pollen vs 250 CFM
  • Coverage area: 1,400 sq ft vs 387 sq ft
  • Blueair Blue Pure 311i Max is $520 cheaper. Pay the difference only if cadr matters to you.

Low running cost

Cheap to own: filter life, power draw, warranty

Too close to call on low running cost from the spec sheets.

  • Filter life: 12–15 months extra long filter life vs 6 to 9 months
  • Energy consumption: 45 W vs 38 W max power consumption

Every answer above is scored from published figures. A lens uses only the rows that matter for that use, including marked rows that are not on the official sheet. Switch lenses interactively in the panel above.

Done deciding?

Open the full standalone spec sheet for either device.

Alen BreatheSmart 75i Large Room Air Purifier spec sheetBlueair Blue Pure 311i Max spec sheet

Manufacturer pages: Alen BreatheSmart 75i Large Room Air Purifier ↗ · Blueair Blue Pure 311i Max ↗

Common questions

Which is cheaper, the Alen BreatheSmart 75i Large Room Air Purifier or the Blueair Blue Pure 311i Max?

Blueair Blue Pure 311i Max costs $520 less at list price.

What is the biggest catch with the Alen BreatheSmart 75i Large Room Air Purifier or Blueair Blue Pure 311i Max?

Blueair Blue Pure 311i Max has this deal-breaker: under 1,000 sq ft coverage. Undersized for an open-plan living area.

Which is better for bedrooms, the Alen BreatheSmart 75i Large Room Air Purifier or the Blueair Blue Pure 311i Max?

For bedrooms, buy the Blueair Blue Pure 311i Max. Leads 2 of 2 rankable bedrooms specs. Noise levels: 23 dB vs 25 dB

What cannot be compared from spec sheets?

Of the 11 specs tracked here, 7 are descriptive and cannot be ranked on numbers alone. Spec sheets also cannot measure subjective factors like build quality, real-world performance, or comfort.

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