Blueair Blue Pure 511i Max: Specs, Price, Pros & Cons
This review measures the Blueair Blue Pure 511i Max against the full 22-spec sheet we track for Air Purifiers, comparing it like for like with the 31 other models in our database. It earns a VS Score of 48 out of 100 — the weighted result of every verified specification measured against the class average.
On the spec sheet it is strongest in design and weakest in filtration. Its clearest single advantage over the class average: a much lower power consumption — 17 W vs 50.21 W (avg). Street prices currently start at $ 118.99 for the Blueair Blue Pure 511i Max. A transparency note: this spec sheet is 86% complete. Anything unverified shows as Unknown and is left out of the score — we never estimate a missing value.
Category strengths
Where the Blueair Blue Pure 511i Max beats the average
- A much lower power consumption ?17 W vs 50.21 W (avg)
- Has washable pre-filter ?
- A lower min noise level ?19 dB vs 22.26 dB (avg)
- A much lighter build ?1.9 kg vs 5.29 kg (avg)
- Has app control ?
- Has air quality sensor ?
- Has auto mode ?
- More filtration stages ?4 vs 3.56 (avg)
- Has activated carbon filter ?
- A slightly lower max noise level ?48 dB vs 51.74 dB (avg)
Where the Blueair Blue Pure 511i Max trails the average
- No true HEPA filter ?
- A lower coverage area ?237 sq ft vs 333.52 sq ft (avg)
- A lower CADR (smoke) ?153 CFM vs 212.72 CFM (avg)
- A lower filter life ?9 months vs 16.24 months (avg)
Editor’s note
The 511i Max is Blueair's smallest smart purifier, and the first thing to settle is the room-size question, because the marketing spread is enormous. Blueair's own page advertises 'up to 1,138 sq ft in one hour'; its AHAM-basis figure – the one that means the air actually turns over nearly five times an hour – is 237 square feet. That second number is the honest one, it matches the smoke CADR arithmetic exactly, and it tells you what this is: a bedroom purifier.
As a bedroom purifier it has two genuinely distinguishing virtues. The first is noise: 19 dB on low is about as quiet as consumer purifiers get, quiet enough to be inaudible from a pillow. The second is running cost: 17 watts flat out and a standard replacement filter at $29.99 that Blueair's tracking algorithm rates for up to nine months. Very few smart purifiers are this cheap to simply leave on.
Two things to understand before buying. Blueair's HEPASilent system is electrostatic-plus-mechanical filtration, not a certified True HEPA filter – the company itself contrasts it with 'H13 HEPA mechanical filtration'. The particle-capture claim is the same 99.97%, but if a certified HEPA class specifically matters to you, this is not that. And the sensor reads PM2.5 only, where the bigger 211i Max adds PM1 and PM10; there is also no voice-assistant support advertised on this model, and Blueair's own page manages to quote two different maximum-noise figures – we recorded the spec table's 48 dB.
At $139.99 list it sits against Levoit's Core 300S, which costs less and carries an actual HEPA label. The Blueair answer is quieter low-speed operation and nicer industrial design. For a nursery or small bedroom, I would pay the difference.
Specifications
Quality bars are generated automatically against 31 other air purifiers.
Performance
Clean Air Delivery Rate — how quickly smoke particles are scrubbed from the air.
The room size the purifier is rated to clean effectively.
How many times the air in the rated room is cycled each hour.
The number of filtration layers air passes through.
Filtration
A certified HEPA filter captures 99.97% of 0.3-micron particles.
The HEPA grade of the main filter (e.g. H13).
A carbon layer absorbs odours, smoke and VOCs.
Pellet-based carbon beds absorb more odour than thin coated sheets.
A rinseable pre-filter catches hair and large dust to extend filter life.
How long the main filter lasts before replacement.
Noise & power
The lowest-speed noise output; quieter suits bedrooms.
Noise at full speed; lower is better.
Maximum power draw; lower costs less to run continuously.
A dimmed, near-silent mode for overnight use.
Design
A lighter unit is easier to move between rooms.
The height of the unit.
Smart features
Measures particle levels to show and react to air quality.
Adjusts fan speed automatically based on measured air quality.
Control and monitor it from a phone app.
Works with Alexa and Google Assistant.
Tells you when the filter needs replacing.
Schedule the purifier to switch off automatically.
How the VS Score works — and what it can’t tell you
Every measurable spec is scored against the average of all the Air Purifiers we track: matching the class average scores 50, clearly beating it climbs towards 100, and each spec counts according to an editorial weight that reflects real-world impact — a battery-capacity gap moves the score far more than a colour-options list. The quality bars on the spec cards above show where this model sits inside the full range for its class, and the overall VS Score rolls every weighted result into one number.
Unknown values are never estimated. A spec this product doesn’t report simply drops out of its scoring — it isn’t penalised with a guess — but a thinner spec sheet does mean a score built on fewer data points, which is why completeness is disclosed under About this data.
Most importantly: a spec-sheet lead is not the same as a better product. Megapixels, gigahertz and benchmark points describe capacity, not experience — image processing, software optimisation, thermals, haptics and ergonomics decide how a device actually feels, and no table captures reliability or long-term support quality. Treat the VS Score as a structured summary of what can be measured, not a substitute for your own priorities.
About this data
- Specifications are compiled from each manufacturer’s official spec sheet, cross-checked against trusted specification databases, and normalised into one schema so identical things are compared identically.
- Specifications last verified August 19, 2026.
- Data completeness: 19 of the 22 specs in this category are verified (86%). Anything we could not verify is shown as Unknown — never estimated — and is excluded from the score.
- Prices and availability come from live retailer feeds via our shopping partners and refresh throughout the day; a missing price means no partner currently lists the product, not that it is discontinued.
- Want the full picture? Our editorial guidelines explain how we research products, weight the scores and stay independent.
- Spotted an error in a spec? Tell us and we will correct the sheet.
Where to buy
Prices and availability may change. Check the retailer before buying. We may earn a commission on purchases.
Price history
Air Purifiers with similar specs to the Blueair Blue Pure 511i Max
Ratings & reviews
No reviews yet. Be the first to share your experience.
The bottom line
The Blueair Blue Pure 511i Max earns a VS Score of 48, a solid mid-pack result among the 32 air purifiers we compare here.
- Who it’s for
- Bedrooms and nurseries: 19 dB on low is pillow-quiet, 17 watts costs pennies to run continuously, and the $30 nine-month filter keeps ownership cheap.
- Who should look elsewhere
- Anyone sizing off the '1,138 sq ft' headline – the honest AHAM figure is 237 sq ft – or buyers who specifically want a certified True HEPA class, which HEPASilent is not.
- The trade-off that matters
- Class-leading quiet and running costs in a small-room machine whose marketing implies three times the coverage it honestly delivers.
- The main alternative
- Levoit Core 300S covers similar ground for less with an actual HEPA label; the Blueair buys quieter low-speed running and better design.
The VS Score is generated automatically from the weighted specifications above, measured against all other air purifiers in our database. Treat it as a shortlisting guide — not a substitute for your own priorities.
