Head to head

Blueair Protect 7470i vs Blueair Blue Pure 211+ Auto

Blueair Protect 7470i leads 4 to 2 on the 6 rankable specs, but Blueair Blue Pure 211+ Auto costs $310 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 211+ Auto lists 353 CFM (Smoke), 347 CFM (Dust), 380 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 211+ Auto lists 550 sq ft (4.8 air changes/hr) / 1,320 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 211+ Auto lists Large living rooms, open floor plans, master suites (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 211+ Auto lists Washable fabric pre-filter + HEPASilent main filter (Particle + Carbon) (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 211+ Auto lists 6 months (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 211+ Auto

$3392 spec wins

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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 2

Buy the Blueair Protect 7470i.

Leads 4 of 6 rankable overall specs; Blueair Blue Pure 211+ Auto takes 2.
Coverage area: 1,035 sq ft vs 550 sq ft
Filter life: 6–12 months with real-time algorithm filter… vs 6 months
Blueair Blue Pure 211+ Auto is $310 cheaper. Pay the difference only if coverage area 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 7470i6 rankable of 11 specsBlueair Blue Pure 211+ Auto 2

Deal-breakers

tick what would make you walk away

No Wi-Fi approw
No schedules or remote control from your phone.
Clear:Blueair Protect 7470i · Blueair App, Alexa, Google Home, GermSh…Trips:Blueair Blue Pure 211+ Auto · One-touch Auto Mode
Over 55 dB on highrow
Louder than normal conversation at full speed.
Clear:Blueair Protect 7470i · 22 dB (Low) – 45 dB (High)Trips:Blueair Blue Pure 211+ Auto · 23 dB (Low) – 56 dB (Turbo high)
Under 1,000 sq ft coveragerow
Undersized for an open-plan living area.
Clear:Blueair Protect 7470i · 1,035 sq ftTrips:Blueair Blue Pure 211+ Auto · 550 sq ft
Over 25 lb (11 kg)row
Hard to move between rooms.
Trips:Blueair Protect 7470i · 27.6 lbClear:Blueair Blue Pure 211+ Auto · 12.5 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 211+ Auto

353 CFM (Smoke), 347 CFM (Dust), 380 CFM (Pollen)

Coverage area

Protect 7470i

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

Blue Pure 211+ Auto

550 sq ft (4.8 air changes/hr) / 1,320 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 211+ Auto

Upfront list price$339

3-Yr Foldable Particle+Carbon filter (Every 6 months (~$45/yr))+$135

3-Year Estimated Total$474

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 211+ Auto: 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.

Blueair Protect 7470i$6494 wins

Blueair Blue Pure 211+ Auto$3392 wins

Performance Filters Usability & Smart Design & Ownership

11 of 11 attributes differ. Identical rows are dimmed.

Performance

3 differences

Performance specifications. Middle column is Blueair Protect 7470i, right column is Blueair Blue Pure 211+ Auto.
CADR	270 CFM (Smoke), 275 CFM (Dust), 280 CFM (Pollen)	353 CFM (Smoke), 347 CFM (Dust), 380 CFM (Pollen) (wins this row: higher)
Room size	Master bedrooms, living areas up to 418 sq ft (5 ACH)	Large living rooms, open floor plans, master suites
Coverage area	1,035 sq ft (2 air changes/hr) / 418 sq ft (5 air changes/hr) (wins this row: higher)	550 sq ft (4.8 air changes/hr) / 1,320 sq ft (2 air changes/hr)

Filters

leads 1-0

Filters specifications. Middle column is Blueair Protect 7470i, right column is Blueair Blue Pure 211+ Auto.
Filter types	SmartFilter with Smart RFID chip (HEPASilent Ultra + Activated Carbon)	Washable fabric pre-filter + HEPASilent main filter (Particle + Carbon)
Filter life	6–12 months with real-time algorithm filter tracking (wins this row: higher)	6 months

Usability & Smart

leads 1-0

Usability & Smart specifications. Middle column is Blueair Protect 7470i, right column is Blueair Blue Pure 211+ Auto.
Noise levels	22 dB (Low) – 45 dB (High) (wins this row: lower)	23 dB (Low) – 56 dB (Turbo high)
Energy consumption	43 W max power (Energy Star certified)	38 W max power consumption
Smart features	Blueair App, Alexa, Google Home, GermShield 24/7 background mode	One-touch Auto Mode (no Wi-Fi app)
Air quality sensors	Laser particle sensor (PM1, PM2.5, PM10), TVOC, Temp, Humidity	Integrated particle sensor with 3-color air quality LED indicator

Design & Ownership

2 differences

Design & Ownership specifications. Middle column is Blueair Protect 7470i, right column is Blueair Blue Pure 211+ Auto.
Weight	27.6 lb (12.5 kg)	12.5 lb (5.7 kg) (wins this row: lower)
Warranty	5 years (with product registration) (wins this row: higher)	2 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 Blueair Blue Pure 211+ Auto source

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 211+ Auto

High-capacity large-room air purifier with 360-degree HEPASilent filtration and machine-washable fabric pre-filters.

High 353 CFM CADR cleans a 550 sq ft living room in just 12.5 minutes
HEPASilent electrostatic + mechanical filtration maximizes airflow and efficiency
Interchangeable washable fabric pre-filters in multiple designer colors

What you give up

No mobile app or Wi-Fi schedule controls (one-button operation)
Reaches 56 dB at highest turbo fan setting

Full Blueair Blue Pure 211+ Auto specs →

Best for each use

Bedrooms

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

Tied on bedrooms. Blueair Blue Pure 211+ Auto is cheaper.

The 2 rankable bedrooms specs split 1 to 1.
Saves $310 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 3 rankable big rooms & allergies specs; Blueair Blue Pure 211+ Auto takes 1.
Coverage area: 1,035 sq ft vs 550 sq ft
Filter life: 6–12 months with real-time algorithm filter… vs 6 months
Blueair Blue Pure 211+ Auto is $310 cheaper. Pay the difference only if coverage area matters to you.

Low running cost

Cheap to own: filter life, power draw, warranty

For low running cost, buy the Blueair Protect 7470i.

Leads 2 of 2 rankable low running cost specs.
Filter life: 6–12 months with real-time algorithm filter… vs 6 months
Warranty: 5 years vs 2 years
Blueair Blue Pure 211+ Auto is $310 cheaper. Pay the difference only if filter life matters to you.

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 sheet Blueair Blue Pure 211+ Auto spec sheet

Manufacturer pages: Blueair Protect 7470i ↗ · Blueair Blue Pure 211+ Auto ↗

Common questions

Which is cheaper, the Blueair Protect 7470i or the Blueair Blue Pure 211+ Auto?

Blueair Blue Pure 211+ Auto costs $310 less at list price.

What is the biggest catch with the Blueair Protect 7470i or Blueair Blue Pure 211+ Auto?

Blueair Blue Pure 211+ Auto has this deal-breaker: no Wi-Fi app. No schedules or remote control from your phone.

Which is better for bedrooms, the Blueair Protect 7470i or the Blueair Blue Pure 211+ Auto?

Tied on bedrooms. Blueair Blue Pure 211+ Auto is cheaper. The 2 rankable bedrooms specs split 1 to 1. Saves $310 at list price.

What cannot be compared from spec sheets?

Of the 11 specs tracked here, 5 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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