Blueair
Blueair Blue Pure 211+ Auto
Air purifiers
$339List price
Explore this product Your shortlist, side by side
Blueair Blue Pure 211+ Auto vs Blueair Blue Pure 311i Max
Find the differences that matter for your next decision.
Blueair
Blueair Blue Pure 311i Max
Air purifiers
$229List price
Explore this product What matters most to you?
Start with all rankable specifications, or focus on a particular use.
Your starting point
Buy the Blueair Blue Pure 211+ Auto.
- Leads 2 of 3 rankable overall specs; Blueair Blue Pure 311i Max takes 1.
- CADR: 353 CFM vs 250 CFM
How we reached this
We compare the published specifications relevant to your priority. Each rankable specification counts once; your selected requirements can rule a product out. This is a guide to the numbers, not a laboratory performance score.
Coverage area: 550 sq ft vs 387 sq ft
Blueair Blue Pure 311i Max is $110 cheaper. Pay the difference only if cadr matters to you.
The trade-off to know
Check first: the Blueair Blue Pure 211+ Auto has no Wi-Fi app. the Blueair Blue Pure 211+ Auto has over 55 dB on high. Tick them under deal-breakers if that rules it out.
Look at the differences ↓Refine your requirements
What would rule one out?
Side by side
The differences, in detail.
Start with the key specs, then explore as much as you need.
| What you’re comparing | Blueair Blue Pure 211+ Auto | Blueair Blue Pure 311i Max |
|---|---|---|
| CADRPerformance | 353 CFM (Smoke), 347 CFM (Dust), 380 CFM (Pollen) | 250 CFM (Smoke), 250 CFM (Dust), 250 CFM (Pollen) |
| Room sizePerformance | Large living rooms, open floor plans, master suites | Medium to large bedrooms, living rooms, and open offices up to 387 sq ft (4.8 ACH) / 929 sq ft (2 ACH) |
| Coverage areaPerformance | 550 sq ft (4.8 air changes/hr) / 1,320 sq ft (2 air changes/hr) | 387 sq ft (4.8 air changes/hr) / 929 sq ft (2 air changes/hr) |
| Filter typesFilters | Washable fabric pre-filter + HEPASilent main filter (Particle + Carbon) | HEPASilent Main Particle + Carbon filter with customizable machine-washable fabric pre-filter |
| Filter lifeFilters | 6 months | 6 to 9 months (tracked by RealTrack algorithm in app) |
Showing 5 of 11 specifications. Missing values stay unlisted. About the sources
Both sides of the decision
What you gain. What you give up.
Blueair Blue Pure 211+ Auto
Reasons to choose it
- 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
Worth considering
- No mobile app or Wi-Fi schedule controls (one-button operation)
- Reaches 56 dB at highest turbo fan setting
Blueair Blue Pure 311i Max
Reasons to choose it
- 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
Worth considering
- Fabric pre-filter covers the exterior and requires periodic vacuuming/washing
- Filter replacements needed every 6 to 9 months
Beyond the spec sheet
Living with your choice.
Explore the ownership details available for this pair.
Is the newer model worth it?
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.
What three years could cost
Blueair Blue Pure 211+ Auto
3-Year Estimated Total$474
Blueair Blue Pure 311i Max
3-Year Estimated Total$334
Room Placement & Bedroom Noise Check
Physical clearance required for airflow, wall placement, and bedroom noise levels.
Wall Clearance Required
Blue Pure 211+ Auto
Requires 12 in perimeter airflow space
Blue Pure 311i Max
360° fabric pre-filter intake (needs 12 in wall space)
Nighttime Sleep Mode Noise
Blue Pure 211+ Auto
Standard sleep speed
Blue Pure 311i Max
23 dB lowest speed setting
Unit Footprint & Dimensions
Blue Pure 211+ Auto
Standard room purifier footprint
Blue Pure 311i Max
Cylindrical aesthetic (12.4 × 12.4 × 18.9 in; 7.8 lb)
Everyday ownership notes
Documented ergonomic quirks, hardware annoyances, and maintenance realities reported by real owners.
Blue Pure 211+ Auto: What to watch for
- Maintenance
Requires periodic filter replacements to maintain airflow and odor capture.
Blue Pure 311i Max: What to watch for
- Maintenance
Outer fabric pre-filter attracts visible pet fur and lint.
Know what’s behind the comparison
Published specs. Visible sources.
Clinchmark compares manufacturer specifications and other published information. We have not independently lab-tested these products. Editorial assessments and unknown values are identified in the specification details.
Catalog snapshot: September 1, 2026. Prices, availability, and provider terms can change.
Still weighing it up?
Which is cheaper, the Blueair Blue Pure 211+ Auto or the Blueair Blue Pure 311i Max?
Blueair Blue Pure 311i Max costs $110 less at list price.
What is the biggest catch with the Blueair Blue Pure 211+ Auto or Blueair Blue Pure 311i Max?
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 Blue Pure 211+ Auto or the Blueair Blue Pure 311i Max?
Too close to call on bedrooms from the spec sheets. Only weight is rankable here. Noise levels: 23 dB vs 23 dB Smart features: One-touch Auto Mode vs Blueair App
What cannot be compared from spec sheets?
Of the 11 specs tracked here, 8 are descriptive and cannot be ranked on numbers alone. Spec sheets also cannot measure subjective factors like build quality, real-world performance, or comfort.