BLUEAIR Blue Pure 511i Max Smart Air Purifier
- Floor Area: 526 sq ft
- Filter Type: Activated Carbon
- Filter Class: HEPA Activated Carbon
- Noise Level: 48 dB
Last refreshed Sep 8, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A compact, app-connected purifier that scales its fan speed automatically and runs down to 19dB for bedroom use.
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ASIN: B08KPJ76RRCategory: HEPA Air Purifiers
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Overview
Blueair's 511i Max is a WiFi-connected HEPASilent purifier built for bedrooms and small rooms, rated to clean a 237 square foot room in about 12.5 minutes and up to 1,138 square feet within an hour. Built-in sensors read air quality and adjust fan speed automatically through Auto Mode.
HEPASilent is Blueair's dual filtration approach, combining mechanical and electrostatic filtration to reach 99.97% capture at 0.1 microns while running quieter than a mechanical-only HEPA fan at the same airflow. The app adds monitoring and filter reminders on top of Auto Mode, useful for checking air quality without walking into the room.
- Up to 1,138 sq ft coverage
- Cleans 237 sq ft in 12.5 minutes
- 99.97% capture at 0.1 microns
- Quiet down to 19dB
Who it's for
Bedrooms, nurseries, and small apartments where both quiet operation and smart monitoring matter. Less relevant for anyone who would rather not pair a purifier with a phone app or does not need remote tracking.
Pros and cons
- Auto Mode adjusts fan speed to real air quality
- Quiet down to 19dB
- App control and filter reminders
- Compact footprint for small rooms
- Coverage tops out at 1,138 sq ft
- Requires the Blueair app for full smart features
Performance notes
Auto Mode relies on onboard air quality sensors to raise or lower fan speed as pollution levels change, rather than running at a fixed setting around the clock, which is what lets it stay at 19dB when the air is already clean. The 360-degree air intake pulls from all sides rather than one face, letting the compact housing fit into smaller rooms without needing clearance on every side.
Specifications
| Brand | Blueair |
|---|---|
| Dimensions & fit | |
| Particle Retention Size | 0.1 |
| Item Weight | 2.8 pounds |
| Item Dimensions D x W x H | 10.6 × 10.6 × 18.9 inches |
| Capacity & performance | |
| Noise Level | 48 dB |
| Power & efficiency | |
| Wattage | 20 watts |
| Power Source | Corded Electric |
| Construction & materials | |
| Color | White/ Slate |
| Included components | |
| Unit Count | 1 |
| Number of Packs | 1 |
| Warranty & support | |
| Software Update Supported To Date | unknown |
| Other details | |
| Floor Area | 526 sq ft |
| Filter Type | Activated Carbon |
| Filter Class | HEPA Activated Carbon |
| Control Type | App, Push Button |
| Part Number | 111178 |
| Special Features | Corded |
| Specification Met | HEPA Certified |
| Item Type Name | Air Purifier |
| Contaminant Filtration Capability | allergen, dust, mold, odor, pet_dander, pollen, smoke |
| Controller Type | Button Control |
Frequently asked questions
How fast does the 511i Max clean a room?
About 12.5 minutes for a 237 sq ft space, and up to 1,138 sq ft within an hour.
Does it need the app to work?
The app adds monitoring, remote control, and filter reminders, while Auto Mode itself runs off the unit's own sensors.
How quiet does it run?
As low as 19dB.