Quick verdict
Buy the standard F2MAX for everyday dust, pollen and dander, since it's the cheapest genuine option and the one the CADR rating is based on. Pay $15 more for SmokeBlock only if smoke or strong odors are your main problem. AllergenBlock and EcoLast are niche upgrades rather than must-haves.
Ideal for
- Blue Pure 211i Max owners replacing the standard filter
- Everyday dust, pollen and pet-dander households
- Buyers who want the cheapest genuine 211i Max option
Not ideal for
- Blue Pure 211, 211+ or 211+ Auto owners (wrong fit)
- Smoke-heavy homes (choose the SmokeBlock version)
The full picture
The F2MAX is the standard main filter for the Blue Pure 211i Max, combining HEPASilent particle media with an activated-carbon layer that Blueair pitches for light household odors. Blueair rates it for up to nine months, with RealTrack estimating wear from fan speed, hours and pollution, and suggests six to nine months in practice. That works out to about $93 to $140 a year at list price. It fits only the 211i Max, not the 211, 211+ or 211+ Auto. The washable fabric pre-filter sleeve is a separate $12.99 part.
Blueair 211i Max Replacement Filter at a glance
- Fits models
- Blueair Blue Pure 211i Max only (not 211, 211+, 211+ Auto or 311i Max)
- Filter type
- Particle + carbon (HEPASilent particle media with activated-carbon layer)
- Pack size
- 1-pack
- Filter life (months)
- 9
- Genuine / compatible
- Genuine OEM (part F2MAX); third-party compatibles exist
- Notable feature
- Also sold as SmokeBlock ($84.99), AllergenBlock ($89.99) and EcoLast ($99.99) versions
Source: Fitment, pricing and life from Blueair's US filter pages for the 211i Max (Particle + Carbon, SmokeBlock, AllergenBlock, EcoLast, pre-filter), checked 2026-10-01. Research-based; not hands-on tested.
This is a research-based review — our analysis draws on manufacturer specifications, manuals, warranty terms, and verified owner feedback rather than our own hands-on testing, and we note where a detail couldn't be confirmed. How we review
Pros and cons
What works
- Exact fit for the 211i Max, and the filter its 435 CFM CADR is rated with
- Cheapest genuine 211i Max option at $69.99
- Up to 9 months of use, tracked by Blueair's RealTrack estimate
- One-piece swap; reset by holding the fan button about 15 seconds
What doesn't
- About $93–$140 a year at list price, more than many rival filters
- Carbon layer is meant for light odors only
- Not interchangeable with 211+ or 211+ Auto filters
More on the Blueair 211i Max Replacement Filter
Best alternatives to Blueair 211i Max Replacement Filter
Winix
Winix 5510/5530 Replacement Filter
For the Winix 5510 / 5520 / 5530
Winix Filter Q (1712-0123-00): the genuine True HEPA + AOC carbon set for the 5510, 5520 and 5530. Lists at $79.99; replace yearly. Does not fit the 5500-2.
Levoit
Levoit Core 300 Replacement Filter
For the Core 300 / 300S
The genuine 3-in-1 replacement for the Levoit Core 300 and 300S — pre-filter, True HEPA, and carbon in one.
Coway
Coway Airmega AP-1512HH Filter Set
For the Airmega Mighty
Genuine Max2 True HEPA plus carbon pre-filters for the Coway Airmega Mighty (AP-1512HH / 200M).
Winix
Winix 5500-2 Filter Set
For the 5500-2
Genuine True HEPA plus washable carbon for the Winix 5500-2 — the washable layer keeps costs down.
Frequently asked questions
Which Blueair 211i Max filter should I buy: Particle + Carbon, SmokeBlock, AllergenBlock or EcoLast?
Particle + Carbon ($69.99) suits most homes. SmokeBlock ($84.99) has twice the activated carbon and is the one for wildfire smoke, a smoker in the house or strong cooking odors. AllergenBlock ($89.99) adds a coating Blueair says neutralizes over 90% of pollen, dust and dander allergen properties, and EcoLast ($99.99) uses wool-based media Blueair says lasts twice as long.
How long does the Blueair 211i Max filter last?
Blueair rates the Particle + Carbon, SmokeBlock and AllergenBlock filters for up to nine months, and its Blue Pure Max FAQ says to expect six to nine months. EcoLast is sold on an 18-month subscription cycle, and Blueair claims it doubles filter life. Heavy smoke or dust will shorten all of these.
Does the 211+ filter fit the 211i Max?
No. The F2MAX filter fits only the Blue Pure 211i Max, and the 211, 211+ and 211+ Auto use a different filter. Check the model name on the label inside your purifier before ordering.
Is the EcoLast filter worth it?
Only if you value the materials or fewer changes. At $99.99 for a claimed 18 months, it works out cheaper per month than the $69.99 standard filter on paper, but it was showing as sold out on Blueair's US store when checked, and the longer life is Blueair's claim.
Are cheaper third-party 211i Max filters OK?
Several compatible filters are sold on Amazon, some advertising H13 media. They may fit, but HEPASilent is tuned for Blueair's own media, and airflow and real CADR with a third-party filter are untested. If you try one, compare how quickly auto mode clears the air afterward.
How do I reset the filter light after changing the 211i Max filter?
Hold the fan-speed button for about 15 seconds until all the interface LEDs light up, then release, according to Blueair. The filter indicator should turn off.