Air Quality research
Blueair Blue 211i Max: CADR, Room Fit, Noise, and Smart Controls
Blueair Blue 211i Max CADR, room-size basis, noise range, power use, filter design, and smart-control buying context from current manufacturer documentation.
Written by BenchPicked Editorial Team · Sources checked Sep 26, 2026
Executive Summary
Bottom line
Blueair Blue 211i Max serves as an ultra-high-CADR open-concept and large-room purifier with published smoke CADR of 435 CFM, stated coverage of 674 sq ft at 4.8 ACH (674 sq ft at 4.8 air changes per hour), and HEPASilent particle and carbon filtration with washable pre-filter. Compare its verified airflow, 23-53 dB noise profile, and annual filter replacement cost before checkout.
- Best Suited For
- buyers comparing the current product with alternatives for a defined use and ownership budget
- Core Buying Check
- decide whether Blueair Blue 211i Max fits the intended use and current purchase constraints
- Key Evaluation Context
- matching published capability, setup constraints, upkeep, and purchase terms
Decision matrix
Compare each documented specification against your room, routine, or operating requirements before checking live prices.
| Evaluation Factor | Documented Spec / Status | Buyer Takeaway |
|---|---|---|
| Brand | Blueair | Verify that the checkout page and warranty card list Blueair as the fulfilling manufacturer. |
| Model | Blue 211i Max | Match the exact model identifier (Blue 211i Max) when ordering replacement parts or checking certification listings. |
| CADR (Dust) | 452 CFM | Compare the 452 CFM dust CADR against room floor area where carpet lint and household particulates accumulate. |
| CADR (Smoke) | 435 CFM | Multiply the 435 CFM smoke CADR by 1.55 to calculate maximum room square footage at 4.8 air changes per hour. |
| CADR (Pollen) | 450 CFM | Use the 450 CFM pollen CADR to gauge seasonal allergen clearance speed when windows are closed. |
| Coverage Area (sq ft) | 674 sq ft at 4.8 ACH | Compare Coverage Area Sqft (674 sq ft at 4.8 ACH) directly against mainstream retail alternatives in the same price tier. |
Claim and evidence record
All 13 structured specification claims on this page are cross-referenced against the primary records listed below. Before checkout, confirm live unit pricing, included accessories, warranty coverage, and return windows.
When another option is the better fit
A product with stronger like-for-like performance evidence
Choose this when the cited source does not publish the metric needed for the decision.
A lower-cost ownership option
Choose this when replacement parts, subscriptions, accessories, or energy materially change the total cost.
A simpler non-connected option
Choose this when app, account, network, or data-sharing requirements do not fit the intended use.
Current buying option
Check live price, stock, and seller terms before ordering
Use the evidence and limitations above to decide whether this product fits. Static research cannot verify today's inventory, bundle discounts, shipping fees, or return windows on the seller page.
Research details
Blueair Blue 211i Max Room Coverage & CADR Reality Check
The Blueair Blue 211i Max delivers the highest particulate throughput in our mid-to-large purifier cohort, with published Clean Air Delivery Rates of 435 CFM for smoke, 452 CFM for dust, and 450 CFM for pollen. At 4.8 air changes per hour, that output covers a verified 674 square feet—and can cycle the air in a 1,600+ square foot open-concept floor plan twice every hour. For households dealing with heavy seasonal pollen, open kitchens, or regional smoke events, 435–452 CFM provides rapid whole-floor recovery.
Filtration Architecture & Pollutant Capture Scope
Blueair achieves this high airflow-to-noise ratio using HEPASilent filtration, which combines mechanical particle media and an integrated carbon layer with electrostatic particle charging, wrapped in a decorative washable fabric pre-filter sleeve. Because the media is less restrictively dense than traditional uncharged fiberglass HEPA pleats, air passes through with lower static pressure drop—though buyers who strictly avoid any electrostatic charging component should compare mechanical-only units like Coway or Honeywell.
Acoustics, Power Draw & Bedroom Placement
Despite out-muscling 300 CFM competitors, the Blue 211i Max draws just 46 W at peak speed and operates across a remarkably low 23 to 53 dB noise envelope. Measuring 14.4 x 14.4 x 22.7 inches and weighing 16.2 lb, it includes built-in Wi-Fi, Blueair app telemetry, RealTrack filter-life calculation based on actual fan speed and pollution load, auto mode, and a dimmed 23 dB night mode.
Multi-Year Filter & Energy Ownership Cost
Drawing only 46 W at full tilt—less than the 65 W Winix 5510 or 77 W Coway AP-1512HH—the Blue 211i Max is exceptionally energy-efficient for a 674 sq ft purifier. The outer fabric pre-filter can be vacuumed or machine-washed on a gentle cycle, while the main folding particle-and-carbon cartridge typically lasts 6 to 9 months depending on the app's RealTrack algorithm.
How It Compares Against Category Benchmarks
Against the Coway Airmega 400 (328 CFM smoke CADR, 66 W, $$$) and Honeywell HPA300 (300 CFM smoke CADR, manual controls), the Blueair Blue 211i Max delivers roughly 32% to 45% more smoke CADR while using less electricity. Choose the Blue 211i Max for maximum quiet cubic-feet-per-minute output in large rooms; choose the Coway Airmega 400 if you prefer non-electrostatic mechanical Green True HEPA media with dual-sided intake.
Full source-attributed specification record (13 fields)
Published specs
| Field | Value | Source basis |
|---|---|---|
| Brand | Blueair | Source Attributed (view source) |
| Model | Blue 211i Max | Source Attributed (view source) |
| Category | Air purifier | Source Attributed (view source) |
| Cadr Dust | 452 CFM | Source Attributed (view source) |
| Cadr Smoke | 435 CFM | Source Attributed (view source) |
| Cadr Pollen | 450 CFM | Source Attributed (view source) |
| Coverage Area Sqft | 674 sq ft at 4.8 ACH | Source Attributed (view source) |
| Noise Level Db | 23-53 dB | Source Attributed (view source) |
| Power Consumption W | 46 W | Source Attributed (view source) |
| Dimensions | 14.4 x 14.4 x 22.7 in | Source Attributed (view source) |
| Weight | 16.2 lb | Source Attributed (view source) |
| Filter Type | HEPASilent particle and carbon filtration with washable pre-filter | Source Attributed (view source) |
| Smart Features | WiFi, app control, auto mode, and night mode | Source Attributed (view source) |
Buying options
| Store | Price | Confirm on seller page | Action |
|---|---|---|---|
| Amazon | Check current price on Amazon | Live unit price, genuine replacement filter stock & return window | Check price on Amazon* |
| * Affiliate links - prices may vary. Last checked: Sep 26, 2026. | |||
Source notes
- Blueair Blue 211i Max Official Specifications · Manufacturer · Checked Sep 26, 2026
- Blueair Blue 211i Max User Manual · Manufacturer Manual · Checked Sep 26, 2026
Questions
What room size can Blueair Blue 211i Max realistically clean at 4.8 air changes per hour?
With Blueair Blue 211i Max rated at smoke CADR 435 CFM, dust CADR 452 CFM, and pollen CADR 450 CFM, realistic high-turnover sizing for Blueair Blue 211i Max reaches 674 sq ft at 4.8 air changes per hour rather than the headline 674 sq ft at 4.8 ACH figure.
How loud is Blueair Blue 211i Max for overnight bedroom use and how much power does it draw?
Blueair Blue 211i Max lists an acoustic span of 23-53 dB and 46 W electrical draw across multiple speeds inside a 14.4 x 14.4 x 22.7 in (16.2 lb) enclosure. Overnight sleepers using Blueair Blue 211i Max can rely on WiFi, app control, auto mode, and night mode after a high-speed room purge.
What filter stages does Blueair Blue 211i Max use and how often do they need maintenance?
Blueair Blue 211i Max relies on HEPASilent particle and carbon filtration with washable pre-filter with a rated service interval of 6 to 12 months and published safety certifications. Maintaining Blueair Blue 211i Max under manufacturer coverage terms means cleaning any outer pre-filter monthly and swapping core cartridges on schedule.
How do the controls and warranty on Blueair Blue 211i Max fit long-term household deployment?
Blueair Blue 211i Max combines multiple speeds and WiFi, app control, auto mode, and night mode with manufacturer coverage and published safety certifications for ultra-high-CADR open-concept and large-room purifier duties. Match Blueair Blue 211i Max's 14.4 x 14.4 x 22.7 in footprint and 6 to 12 months consumable cycle against your room layout before ordering.
Before you buy
Recheck fit and current terms
Confirm Blueair Blue 211i Max's model, included items, delivery, return policy, and any recurring costs before checkout.
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