Which models does the Blueair Blue Pure 211+ Auto replacement filter fit?

It fits Blue Pure 211+ Auto — and Blueair says "only". Its own instruction for telling which unit you have is physical and takes two seconds: "If the position of the main button is on the top of the air purifier, you have a 211+ Auto model and this filter is compatible.". It does not fit ⚠️ THE STANDARD BLUE PURE 211+ — and this is the case worth reading twice, because the problem is not that it will not go in. Blueair states: "This filter is compatible with the Blue Pure 211+ Auto model only. If used with the standard Blue Pure 211+ model the clean air delivery rate (CADR) will decline." A filter that physically fits and quietly makes the machine worse is a harder mistake to catch than one that does not fit at all: nothing warns you, the unit runs, and the only symptom is less clean air than you paid for., ⚠️ AND IT WORKS IN BOTH DIRECTIONS, WITH A CONSEQUENCE. Blueair also states: "Fitting a non-Auto filter reduces these CADR values and voids the warranty." So the wrong choice here is not only a performance loss — by the manufacturer's own words it ends the warranty on the machine., Blue Pure 211i Max — a different unit that takes the F2MAX filter, which Blueair sells as its own product..

Blueair Blue Pure 211+ Auto replacement filter

Q: What is the part number for the Blueair Blue Pure 211+ Auto replacement filter?

"Blue Pure 211+ Auto Particle + Carbon Filter".

By the NestyFinds editorial team · Researched from manufacturer documentation, manuals and the AHAM Verifide directory · Reviewed: September 2026

The part you need

"Blue Pure 211+ Auto Particle + Carbon Filter"

The combined cartridge for Blueair's large tower.

Blueair says: ⚠️ BLUEAIR DOES NOT STATE AN INTERVAL ON THIS FILTER'S PRODUCT PAGE.

Check current price

Price, seller and package contents change. Check the variant on Amazon before you buy.

Does it fit your unit?

Fits these models

Blue Pure 211+ Auto — and Blueair says "only". Its own instruction for telling which unit you have is physical and takes two seconds: "If the position of the main button is on the top of the air purifier, you have a 211+ Auto model and this filter is compatible."

Does NOT fit — commonly confused

⚠️ THE STANDARD BLUE PURE 211+ — and this is the case worth reading twice, because the problem is not that it will not go in. Blueair states: "This filter is compatible with the Blue Pure 211+ Auto model only. If used with the standard Blue Pure 211+ model the clean air delivery rate (CADR) will decline." A filter that physically fits and quietly makes the machine worse is a harder mistake to catch than one that does not fit at all: nothing warns you, the unit runs, and the only symptom is less clean air than you paid for.
⚠️ AND IT WORKS IN BOTH DIRECTIONS, WITH A CONSEQUENCE. Blueair also states: "Fitting a non-Auto filter reduces these CADR values and voids the warranty." So the wrong choice here is not only a performance loss — by the manufacturer's own words it ends the warranty on the machine.
Blue Pure 211i Max — a different unit that takes the F2MAX filter, which Blueair sells as its own product.

Variants Blueair sells

Particle + Carbon — the only media variant named on the 211+ Auto filter page itself.
The non-Auto 211/211+ range does have SmokeBlock and AllergenBlock versions. They belong to the other filter, not to this one: see the compatibility warnings above before assuming a variant of the wrong filter is safer than the wrong filter.

Units we have researched that take this filter: Blueair Blue Pure 211+ Auto .

What each part number is

"Blue Pure 211+ Auto Particle + Carbon Filter": the full product name is the identifier. Blueair prints no SKU on the filter page (checked 14-sep-2026). ⚠️ The words that matter in that name are AUTO and the plus sign: there are filters for this family that differ only by those.

What the manufacturer documents

What is in the set

The combined cartridge for Blueair's large tower. A particle layer Blueair describes as capturing "PM 2.5, pollen, dust mite matter, pet dander allergen" and an activated carbon layer for household odours, using what Blueair calls HEPASilent — its term for combining "electrostatic and mechanical filtration".

This is the one page in our filter catalogue where the important content is not what fits. It is what fits AND SHOULD NOT BE USED ANYWAY.

How often to change it

⚠️ BLUEAIR DOES NOT STATE AN INTERVAL ON THIS FILTER'S PRODUCT PAGE. Checked 14-sep-2026. Its subscription option defaults to six months, which is a shipping cadence rather than a measurement, and we are not going to present it as the manufacturer's stated filter life.

What Blueair does publish elsewhere in this range is how its units decide: on the sister 511 model the stated approach is an algorithm that tracks fan speed, running time and measured pollution rather than days. On a unit whose whole selling point is Auto mode, the indicator is the figure to trust, not a number from a page that does not give one.

Blueair’s page for this filter

Genuine vs third-party filters

Blueair's published position here is unusually concrete, and it is about fit rather than about brand: fitting a non-Auto filter "reduces these CADR values and voids the warranty". That is a statement about the WRONG FILTER, including Blueair's own wrong filter, not about third-party manufacturers.

On third parties Blueair publishes nothing we could locate. As everywhere in this category, no replacement filter carries an independent performance measurement, so there is no comparison to report.

That is Blueair’s stated position, reported as theirs. We have not tested third-party filters and make no claim about how well they work.

When something goes wrong

Symptom	Why it happens	What to do
Not knowing whether the unit is a 211+ or a 211+ Auto.	The two look alike and the model name differs by one word. Getting it wrong has consequences beyond fit.	Blueair's own test: look at where the main button is. On top means it is the Auto, and this filter is the right one. That check takes less time than reading a listing.
The filter went in fine, so it must be the right one.	On this family the wrong filter fits. Blueair says the CADR declines rather than that the filter is rejected.	Fit is not the test here. Match the model — Auto or not Auto — before ordering, because the machine will not tell you afterwards.
Warranty refused after a filter change.	Blueair states that fitting a non-Auto filter voids the warranty.	Keep the packaging and the order record for the filter you fitted, and check the model match before fitting rather than after.