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Head to head

Blueair Protect 7470i vs Blueair Blue Pure 311i Max

Blueair Protect 7470i leads 4 to 1 on the 5 rankable specs, but Blueair Blue Pure 311i Max costs $420 less.

Catalog as of September 1, 2026

Why, in numbers

  • CADR: Blueair Protect 7470i lists 270 CFM (Smoke), 275 CFM (Dust), 280 CFM (Pollen) (Blueair 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: Blueair Protect 7470i lists 1,035 sq ft (2 air changes/hr) / 418 sq ft (5 air changes/hr) (Blueair 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: Blueair Protect 7470i lists Master bedrooms, living areas up to 418 sq ft (5 ACH) (Blueair 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: Blueair Protect 7470i lists SmartFilter with Smart RFID chip (HEPASilent Ultra + Activated Carbon) (Blueair 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: Blueair Protect 7470i lists 6–12 months with real-time algorithm filter tracking (Blueair 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.

Blueair Protect 7470i
$6494 spec wins
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Blueair Blue Pure 311i Max
$2291 spec win
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Generational Upgrade Analysis

Generational Comparison

Blueair sibling models compared across generations.

Our recommendation: Compare the spec differences below to see if the price premium justifies the newer model's additions.

Buying for

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

Straight answer

Overall: 4 to 1

Buy the Blueair Protect 7470i.

  • Leads 4 of 5 rankable overall specs; Blueair Blue Pure 311i Max takes 1.
  • CADR: 270 CFM vs 250 CFM
  • Coverage area: 1,035 sq ft vs 387 sq ft
  • Blueair Blue Pure 311i Max is $420 cheaper. Pay the difference only if cadr matters to you.

Check first: the Blueair Protect 7470i weighs over 25 lb (11 kg). Tick them under deal-breakers if that rules it out.

4 Blueair Protect 7470i5 rankable of 11 specsBlueair Blue Pure 311i Max 1

Deal-breakers

tick what would make you walk away

  • row

    Undersized for an open-plan living area.

    Clear:Blueair Protect 7470i · 1,035 sq ftTrips:Blueair Blue Pure 311i Max · 387 sq ft
  • row

    Hard to move between rooms.

    Trips:Blueair Protect 7470i · 27.6 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

Protect 7470i

270 CFM (Smoke), 275 CFM (Dust), 280 CFM (Pollen)

Blue Pure 311i Max

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

Coverage area

Protect 7470i

1,035 sq ft (2 air changes/hr) / 418 sq ft (5 air changes/hr)

Blue Pure 311i Max

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

True 3-Year Cost of Ownership (TCO)

Upfront price + 3 years of consumables, fees & essential add-ons

Blueair Protect 7470i

Upfront list price$649
3-Yr SmartFilter RFID dual-layer (Every 12 months (~$80/yr))+$240
3-Year Estimated Total$889

Blueair Blue Pure 311i Max

Upfront list price$229
3-Yr SmokeBlock combo filter (Every 6–9 months (~$35/yr))+$105
3-Year Estimated Total$334

Room Placement & Bedroom Noise Check

Physical clearance required for airflow, wall placement, and bedroom noise levels.

Ergonomic & Spatial Check

Wall Clearance Required

Cylindrical 360° filters cannot sit flush against walls without choking intake.

Protect 7470i

Requires 12 in perimeter airflow space

Blue Pure 311i Max

360° fabric pre-filter intake (needs 12 in wall space)

Nighttime Sleep Mode Noise

Levels below 25 dB are virtually silent for light sleepers.

Protect 7470i

Standard sleep speed

Blue Pure 311i Max

23 dB lowest speed setting

Unit Footprint & Dimensions

Protect 7470i

Standard room purifier footprint

Blue Pure 311i Max

Cylindrical aesthetic (12.4 × 12.4 × 18.9 in; 7.8 lb)

The 90-Day Owner Regret Check

Documented ergonomic quirks, hardware annoyances, and maintenance realities reported by real owners.

Post-Purchase Truths

Protect 7470i: What to watch for

  • Maintenance

    Requires periodic filter replacements to maintain airflow and odor capture.

    Activated carbon and HEPA media gradually saturate, needing replacement once or twice yearly depending on air pollution and pet shedding.

Blue Pure 311i Max: What to watch for

  • Maintenance

    Outer fabric pre-filter attracts visible pet fur and lint.

    The decorative fabric outer sleeve functions as the coarse pre-filter, requiring weekly vacuuming to avoid looking dusty in living rooms.

Blueair Protect 7470i$6494 wins
Blueair Blue Pure 311i Max$2291 win

Performance

leads 2-0
Performance specifications. Middle column is Blueair Protect 7470i, right column is Blueair Blue Pure 311i Max.
CADR270 CFM (Smoke), 275 CFM (Dust), 280 CFM (Pollen) (wins this row: higher)250 CFM (Smoke), 250 CFM (Dust), 250 CFM (Pollen)
Room sizeMaster bedrooms, living areas up to 418 sq ft (5 ACH)Medium to large bedrooms, living rooms, and open offices up to 387 sq ft (4.8 ACH) / 929 sq ft (2 ACH)
Coverage area1,035 sq ft (2 air changes/hr) / 418 sq ft (5 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 Blueair Protect 7470i, right column is Blueair Blue Pure 311i Max.
Filter typesSmartFilter with Smart RFID chip (HEPASilent Ultra + Activated Carbon)HEPASilent Main Particle + Carbon filter with customizable machine-washable fabric pre-filter
Filter life6–12 months with real-time algorithm filter tracking6 to 9 months (tracked by RealTrack algorithm in app)

Usability & Smart

leads 1-0
Usability & Smart specifications. Middle column is Blueair Protect 7470i, right column is Blueair Blue Pure 311i Max.
Noise levels22 dB (Low) – 45 dB (High) (wins this row: lower)23 dB (Night mode) – 50 dB (Max boost)
Energy consumption43 W max power (Energy Star certified)38 W max power consumption (Energy Star Most Efficient)
Smart featuresBlueair App, Alexa, Google Home, GermShield 24/7 background modeBlueair App (iOS/Android), voice control with Amazon Alexa and Google Assistant, geofencing Welcome Home feature
Air quality sensorsLaser particle sensor (PM1, PM2.5, PM10), TVOC, Temp, HumidityLaser particle sensor with 5-color LED air quality indicator ring (PM1, PM2.5, PM10)

Design & Ownership

2 differences
Design & Ownership specifications. Middle column is Blueair Protect 7470i, right column is Blueair Blue Pure 311i Max.
Weight27.6 lb (12.5 kg)7.8 lb (3.5 kg) (wins this row: lower)
Warranty5 years (with product registration) (wins this row: higher)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.
Blueair Protect 7470i 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

Blueair Protect 7470i

HEPASilent Ultra smart air purifier with 24/7 GermShield bacterial protection and SpiralAir 360 vents.

  • HEPASilent Ultra electrostatic + mechanical filtration kills 99% of germs
  • SpiralAir omnidirectional airflow distributes clean air evenly
  • Premium matte build with intuitive LCD air quality touchscreen

What you give up

  • SmartFilter replacements are relatively costly
  • Heavier metallic construction
Full Blueair Protect 7470i 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

Tied on bedrooms. Blueair Blue Pure 311i Max is cheaper.

  • The 2 rankable bedrooms specs split 1 to 1.
  • Saves $420 at list price.

Big rooms & allergies

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

For big rooms & allergies, buy the Blueair Protect 7470i.

  • Leads 2 of 2 rankable big rooms & allergies specs.
  • CADR: 270 CFM vs 250 CFM
  • Coverage area: 1,035 sq ft vs 387 sq ft
  • Blueair Blue Pure 311i Max is $420 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. Only warranty is rankable here.

  • Filter life: 6–12 months with real-time algorithm filter… vs 6 to 9 months
  • Energy consumption: 43 W max power 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.

Blueair Protect 7470i spec sheetBlueair Blue Pure 311i Max spec sheet

Manufacturer pages: Blueair Protect 7470i ↗ · Blueair Blue Pure 311i Max ↗

Common questions

Which is cheaper, the Blueair Protect 7470i or the Blueair Blue Pure 311i Max?

Blueair Blue Pure 311i Max costs $420 less at list price.

What is the biggest catch with the Blueair Protect 7470i 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 Blueair Protect 7470i or the Blueair Blue Pure 311i Max?

Tied on bedrooms. Blueair Blue Pure 311i Max is cheaper. The 2 rankable bedrooms specs split 1 to 1. Saves $420 at list price.

What cannot be compared from spec sheets?

Of the 11 specs tracked here, 6 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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