Blueair Blue Pure 211i Max Air Purifier: CADR, Noise, Coverage & Specs

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Last verified: Aug 22, 2026

Aug 2026

Quick verdict

The Blueair Blue Pure 211i Max is best suited to large rooms where high airflow, quiet minimum operation, and app control are priorities. Its 435 CFM smoke CADR supports about 674 sq ft at approximately 4.8 air changes per hour. Buyers should separately evaluate filter cost, maximum-speed noise, and Blueair’s HEPASilent filtration before deciding.

Best for

  • Large open rooms
  • Low-noise minimum settings
  • App or Wi-Fi control

Consider alternatives if

  • You need a verified maximum-speed noise figure
  • Filter replacement interval or cost is a deciding factor
  • You are planning around the manufacturer coverage claim rather than CADR-based room size

Verified strengths

  • 435 CFM smoke CADR (~674 sq ft at ~4.8 ACH)
  • 23 dB published minimum noise
  • HEPASilent filtration (as published)
  • Wi-Fi or app control

Verified limitations or missing information

  • Maximum-speed noise is not in our sources
  • Filter replacement interval is not verified

Blueair Blue Pure 211i Max overview

The Blueair Blue Pure 211i Max is a large-room air purifier with a smoke CADR of 435 CFM. Based on our CADR-based room-size method, it is suitable for approximately 674 sq ft. It includes HEPASilent filtration, 23 dB minimum noise, and Wi-Fi or app support.

Smoke CADR
435 CFM
Recommended room size
674 sq ft
Claimed coverage
3235 sq ft
Minimum noise
23 dB
Filter type
HEPASilent
Wi-Fi / app
Yes
Power
46 W
Dimensions
22.7 × 14.4 × 14.4 in
Weight
16.2 lb
Last verified
Aug 22, 2026

Blueair Blue Pure 211i Max CADR and room size

Recommended room size is about 674 sq ft (CADR × 1.55). That is approximately 4.8 air changes per hour in a room with an eight-foot ceiling. The manufacturer figure of 3235 sq ft corresponds to about 1.0 air change per hour at the same ceiling height and is shown separately. Our recommended room size uses approximately 4.8 air changes per hour with an eight-foot ceiling. Manufacturer coverage figures may use a lower air-change rate and are shown separately.

The manufacturer coverage claim is higher than 3× CADR, so it is not used for ranking.

Blueair Blue Pure 211i Max noise level

Published minimum noise is 23 dB.

Maximum-speed noise is not in our sources.

Blueair Blue Pure 211i Max filtration

Published filter type: HEPASilent.

Blueair describes HEPASilent as a combination of mechanical and electrostatic filtration. We do not independently verify particle-removal efficiency.

Filter replacement interval is not verified in our sources.

Blueair Blue Pure 211i Max smart features

Captures 99.97% of particles as small as 0.1 microns, RealTrack technology for filter lifetime tracking, WiFi connectivity with smart features

Blueair Blue Pure 211i Max specifications

CADR (smoke)
435 CFM
Recommended room size
674 sq ft
Manufacturer claimed coverage
3235 sq ft
Minimum noise
23 dB
Filter type
HEPASilent
Power
46 W
Dimensions
22.7 × 14.4 × 14.4 in
Weight
16.2 lb
Wi-Fi / app
Yes

About Blueair air purifiers

Blueair models in this catalog are compared by CADR, recommended room size, noise, and filter type.

See all Blueair air purifiers

Blueair Blue Pure 211i Max comparisons

Compared with the Blueair Blue Signature, the Blueair Blue Pure 211i Max has 4% lower CADR.

What is the CADR of the Blueair Blue Pure 211i Max?

Smoke CADR is 435 CFM.

What room size is the Blueair Blue Pure 211i Max suitable for?

About 674 sq ft at approximately 4.8 air changes per hour with an eight-foot ceiling.

How loud is the Blueair Blue Pure 211i Max?

Minimum reported noise: 23 dB.

Does the Blueair Blue Pure 211i Max have Wi-Fi?

Yes — app or Wi-Fi features are listed.

What filter does the Blueair Blue Pure 211i Max use?

HEPASilent.

Methodology

Specifications are compiled from manufacturer documentation, product listings and other cited sources.

How we calculate recommended room size.

Sources

All air purifiers · Blueair air purifiers · Best air purifiers for allergies · Methodology