Blueair 211i Max review
Blueair Blue Pure 211i Max Air Purifier
By Tom Calder
Key specs
The maker's figures.
- Coverage (maker)
- 674 sq ft in 12.5 min; 3,235 sq ft per hour
- CADR
- —
- Filter
- HEPASilent dual filtration
High airflow for big open-plan rooms, and quiet. Pricier.
- Best for
- For large living areas
- Skip it if
- You're cleaning one small room
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Researched, not used. We haven't used this product. This review is built from the maker's specifications, owner reports and our own sizing.
What we like
- Large-room airflow
- Quiet
Worth knowing
- Expensive
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Our review
The Blueair Blue Pure 211i Max is a large-room purifier Blueair rates at a smoke CADR of 435 cfm, cleaning a 674-square-foot room every 12.5 minutes, at 46 W, 16.2 lb and 23 to 53 dB. This researched review reads Blueair's product page and the EPA's air cleaner guidance, explains the HEPASilent filter, and says when the smaller Coway is the smarter buy.
What Blueair lists
Blueair's page describes the 211i Max as a smart HEPASilent air purifier for large rooms and open spaces that automatically adjusts to your air. Its clean air delivery rates are 450 cfm for pollen, 452 for dust and 435 for smoke, and it is rated to clean 674 square feet every 12.5 minutes, or 3,235 square feet in an hour. Blueair notes its CADR and room-size figures have been updated to meet new Department of Energy standards and may differ from the packaging during the transition.
The spec table gives 46 W energy consumption, a 16.2 lb weight and 23 to 53 dB; Blueair says it is quieter than a whisper on low at 23 dB and no louder than 53 dB on high. The filter is a particle and carbon unit with a washable fabric pre-filter, and Blueair says the filter lasts up to 9 months, tracked by its RealTrack algorithm from fan speed, usage time and pollution levels.
HEPASilent, and what it captures
Blueair's HEPASilent dual filtration combines electrostatic and mechanical filtration, which it says removes 99.97 percent of airborne particles down to 0.1 microns, including pollen, smoke, dust, pet dander and mold. The electrostatic stage lets it move a lot of air through a less dense filter, which is where the low wattage and the low noise come from. Blueair's FAQ says the 211i Max's sensor measures PM1, PM2.5 and PM10 rather than PM2.5 alone, which is useful for watching smoke levels indoors.
The EPA's guidance is that the higher the CADR, the more particles a cleaner can filter and the larger the area it can serve, and that the CADR should be large enough for the room. Its sizing chart tops out at 390 cfm for a 600-square-foot room with 8-foot ceilings, so at 435 cfm for smoke the 211i Max covers an open-plan kitchen and living area, or a whole small apartment with the doors open.
Using it for wildfire smoke
Blueair's FAQ says to put it in a room around 674 square feet so it can clean the air at the AHAM recommendation of roughly five changes an hour, and that it will clean a 1,618-square-foot space in 30 minutes. In a smoke event, our wildfire smoke guide says to close up one room and run the purifier there; this unit lets that room be the main living space rather than a bedroom. The EPA notes a cleaner with a high CADR and an activated carbon filter can filter particles and gases; the 211i Max's carbon layer helps with smoke smell but is not a gas-phase filter.
At 46 W it is frugal for its size, so a power station keeps it running through an outage: a 1 kWh unit gives about 20 hours on high.
Filters, warranty and what is missing
Blueair offers a replacement filter subscription and says registering the product extends the 1-year warranty to 3 years. Nine months is Blueair's maximum filter life; heavy smoke shortens it, so keep a spare before fire season. Energy Star and AHAM Verifide appear on the page only as logos, so we have not claimed either in words, and Blueair gives no dimensions in the text we read.
How it compares, and who should skip it
The Coway Airmega AP-1512HH has about half the smoke CADR at 233, is rated for 361 square feet at 4.8 changes an hour, and costs less; it is the better buy for a single bedroom. The Blueair is the one for a large open room or a whole floor, and it is quieter and more efficient for the air it moves. Our air purifier comparison lists both, and the 3M Aura N95 covers anyone who has to go out.
Skip the 211i Max if you are cleaning one small room, if you want a filter that lasts a year or more, or if you want proven gas and odor removal rather than particle filtration with a carbon assist.
A researched review, built from the maker's specs, manual and US listings; facts checked 2 Nov 2026. Sources: Blueair: Blue Pure 211i Max product page; EPA: guide to air cleaners in the home.
Who shouldn't buy this
Don't buy it if you're cleaning one small room.
This is a Researched review: we haven't used this product. We check every specification against at least two independent sources, re-check the US price on a schedule where we can track it automatically, and say plainly who it isn't for. Commissions never change a rating.
If this isn’t the one
Best for The proven pick for wildfire smoke
Read the review →Best for Large living rooms in smoke season
See the comparison →Best for Budget bedroom purifier with a stated CADR
See the comparison →Questions
How big a room is the Blue Pure 211i Max for?
Blueair rates it for 674 square feet, cleaned every 12.5 minutes, and says it will clean 1,618 square feet in 30 minutes. Its smoke CADR of 435 cfm exceeds the EPA's 390 cfm minimum for a 600-square-foot room.
How long does the filter last?
Blueair says up to 9 months, with its RealTrack feature estimating the remaining life from fan speed, run time and pollution. Heavy smoke shortens that, so keep a spare.
How loud and how much power?
Blueair lists 23 dB on low and 53 dB on high, and 46 W, which is low for a purifier moving this much air and makes it easy to run from a power station.
What is the warranty?
Blueair says registering the product extends the 1-year warranty to 3 years, so register it when it arrives.