Blueair Blue Pure 311i Max Air Purifier: CADR, Noise, Coverage & Specs
Last verified: Aug 22, 2026
Aug 2026
Quick verdict
The Blueair Blue Pure 311i Max is best suited to large rooms where high airflow, quiet minimum operation, and app control are priorities. Its 365 CFM smoke CADR supports about 566 sq ft at approximately 4.8 air changes per hour. Buyers should separately evaluate 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
- You are planning around the manufacturer coverage claim rather than CADR-based room size
Verified strengths
- 365 CFM smoke CADR (~566 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
Blueair Blue Pure 311i Max overview
The Blueair Blue Pure 311i Max is a large-room air purifier with a smoke CADR of 365 CFM. Based on our CADR-based room-size method, it is suitable for approximately 566 sq ft. It includes HEPASilent filtration, 23 dB minimum noise, and Wi-Fi or app support.
- Smoke CADR
- 365 CFM
- Recommended room size
- 566 sq ft
- Claimed coverage
- 2107 sq ft
- Minimum noise
- 23 dB
- Filter type
- HEPASilent
- Wi-Fi / app
- Yes
- Power
- 32 W
- Dimensions
- 19 × 12.5 × 12.5 in
- Weight
- 7.8 lb
- Last verified
- Aug 22, 2026
Blueair Blue Pure 311i Max CADR and room size
Recommended room size is about 566 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 2107 sq ft corresponds to about 1.3 air changes 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 311i Max noise level
Published minimum noise is 23 dB.
Maximum-speed noise is not in our sources.
Blueair Blue Pure 311i 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.
Replacement interval: 9 months.
Blueair Blue Pure 311i Max smart features
Removes 99.97% of airborne particles down to 0.1 microns, WiFi connectivity and auto-mode, LED air quality indicator, Ultra-quiet performance
Blueair Blue Pure 311i Max specifications
- CADR (smoke)
- 365 CFM
- Recommended room size
- 566 sq ft
- Manufacturer claimed coverage
- 2107 sq ft
- Minimum noise
- 23 dB
- Filter type
- HEPASilent
- Filter replacement interval
- 9 months
- Power
- 32 W
- Dimensions
- 19 × 12.5 × 12.5 in
- Weight
- 7.8 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.
Blueair Blue Pure 311i Max comparisons
Compared with the Blueair Blue Pure 211+, the Blueair Blue Pure 311i Max has 4% higher CADR.
What is the CADR of the Blueair Blue Pure 311i Max?
Smoke CADR is 365 CFM.
What room size is the Blueair Blue Pure 311i Max suitable for?
About 566 sq ft at approximately 4.8 air changes per hour with an eight-foot ceiling.
How loud is the Blueair Blue Pure 311i Max?
Minimum reported noise: 23 dB.
Does the Blueair Blue Pure 311i Max have Wi-Fi?
Yes — app or Wi-Fi features are listed.
What filter does the Blueair Blue Pure 311i 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