Alen
Alen BreatheSmart 75i Large Room Air Purifier
Air purifiers
$749List price
Explore this product Your shortlist, side by side
Alen BreatheSmart 75i Large Room Air Purifier 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
Tied overall. Blueair Blue Pure 311i Max is cheaper.
- The 4 rankable overall specs split 2 to 2.
- Saves $520 at list price.
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.
The trade-off to know
Check first: the Blueair Blue Pure 311i Max has under 1,000 sq ft coverage.
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 | Alen BreatheSmart 75i Large Room Air Purifier | Blueair Blue Pure 311i Max |
|---|---|---|
| CADRPerformance | 350 CFM across Smoke, Dust, Pollen | 250 CFM (Smoke), 250 CFM (Dust), 250 CFM (Pollen) |
| Room sizePerformance | Large master suites, open living rooms, offices | Medium to large bedrooms, living rooms, and open offices up to 387 sq ft (4.8 ACH) / 929 sq ft (2 ACH) |
| Coverage areaPerformance | 1,400 sq ft (2 air changes/hr) / 700 sq ft (4 air changes/hr) | 387 sq ft (4.8 air changes/hr) / 929 sq ft (2 air changes/hr) |
| Filter typesFilters | Medical-grade H13 True HEPA + Antimicrobial layer + Heavy Odor Carbon | HEPASilent Main Particle + Carbon filter with customizable machine-washable fabric pre-filter |
| Filter lifeFilters | 12–15 months extra long filter life | 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.
Alen BreatheSmart 75i Large Room Air Purifier
Reasons to choose it
- Industry-exclusive transferable Lifetime Warranty
- Tuned pink noise frequencies promote deeper sleep on WhisperMax mode
- Medical-grade H13 True HEPA filter lasts up to 15 months
Worth considering
- High initial investment
- Tall tower profile
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.
What three years could cost
Alen BreatheSmart 75i Large Room Air Purifier
3-Year Estimated Total$1,046
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
Alen
Requires 12 in perimeter airflow space
Blueair
360° fabric pre-filter intake (needs 12 in wall space)
Nighttime Sleep Mode Noise
Alen
Standard sleep speed
Blueair
23 dB lowest speed setting
Unit Footprint & Dimensions
Alen
Standard room purifier footprint
Blueair
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.
Alen: What to watch for
- Maintenance
Requires periodic filter replacements to maintain airflow and odor capture.
Blueair: 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 Alen BreatheSmart 75i Large Room Air Purifier or the Blueair Blue Pure 311i Max?
Blueair Blue Pure 311i Max costs $520 less at list price.
What is the biggest catch with the Alen BreatheSmart 75i Large Room Air Purifier 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 Alen BreatheSmart 75i Large Room Air Purifier or the Blueair Blue Pure 311i Max?
For bedrooms, buy the Blueair Blue Pure 311i Max. Leads 2 of 2 rankable bedrooms specs. Noise levels: 23 dB vs 25 dB
What cannot be compared from spec sheets?
Of the 11 specs tracked here, 7 are descriptive and cannot be ranked on numbers alone. Spec sheets also cannot measure subjective factors like build quality, real-world performance, or comfort.