Blueair Blue Pure 311i Max Smart Air Purifier
- 439 sq ft in 12.5 minutes, 2,107 sq ft in 1 hour
- HEPASilent filtration, 99.97% down to 0.1 microns
- CADR 250 smoke, dust and pollen
- 23 to 50 dB, QuietMark certified
- Auto mode sensors, app control, Alexa
- Pre-installed filter and washable pre-filter
Last refreshed Sep 8, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A quiet, sensor driven purifier for bedrooms, living rooms and offices with pets or allergies. Replacement filters are an ongoing need.
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ASIN: B0BN2LZ9JHCategory: HEPA Air Purifiers
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Overview
Mechanical and electrostatic filtration work together in the Blueair Blue Pure, charging particles so a looser filter can trap them while air flows freely. Sensors raise fan speed when pollution spikes, and air enters from all sides.
Quiet running with strong airflow makes it easy to leave on in a bedroom. The app tracks filter life, but filters still need replacing on schedule.
Who it's for
Suited to medium rooms, apartments and nurseries. Large open plan homes may need a bigger unit.
Pros and cons
- Very quiet at low speed
- Auto mode with sensors
- App air quality tracking
- Washable fabric pre-filter
- Filters need replacing
- Filter type labels conflict
- No display of particle counts listed
Performance notes
Electrostatic charging helps the filter capture fine particles without heavy airflow resistance, which holds noise and power down. Room coverage depends on how many times per hour the air passes through. Sensors raise speed when smoke or dust rises.
Specifications
| Brand | Blueair |
|---|---|
| Dimensions & fit | |
| Particle Retention Size | 0.1 micron |
| Item Dimensions D x W x H | 12.5 x 12.5 x 19 inches |
| Item weight | 3.5 kg |
| Capacity & performance | |
| Noise Level | 23 to 50 dB |
| Wattage | 7.8 watts |
| Included components | |
| Included Components | Air purifier, pre-installed filter, washable pre-filter |
| Other details | |
| Floor Area | 439 sq ft in 12.5 minutes, 2,107 sq ft in 1 hour |
| Filter Class | HEPASilent, activated carbon |
| Control Type | App, touch, Amazon Alexa |
| Clean air delivery rate | 250 |
| Specification Met | AHAM Verifide |
Frequently asked questions
How big is the Blueair Blue Pure 311i Max?
It measures 12.5 x 12.5 x 19 inches and weighs 3.5 kg.
What size room does the Blue Pure 311i Max cover?
It cleans 439 sq ft in 12.5 minutes and 2,107 sq ft in 1 hour.
Does the Blue Pure 311i Max adjust itself?
Yes. Built-in sensors raise fan speed when pollution rises.
Is the 311i Max quiet enough for a nursery?
It runs between 23 and 50 dB and is QuietMark certified.