Which models does the Blueair Blue Pure 411 replacement filter fit?

It fits Blue Pure 411, Blue Pure 411+, Blue Pure 411 Auto. It does not fit Blue Pure 411a, 411i Max and 411i+ — these take the F4MAX filter instead, which Blueair sells as a separate product. One letter of difference in the model name, a different cartridge. This is the wrong order waiting to happen in this family., The PRE-FILTERS are not interchangeable even within the models this cartridge does fit. Blueair lists a Blue Pure 411 Pre-filter, a Blue Pure 411 Auto Pre-Filter and a Blue Pure 411+ Pre-filter as three separate products. Order the sleeve for your exact unit, not for the series..

Blueair Blue Pure 411 replacement filter

Q: What is the part number for the Blueair Blue Pure 411 replacement filter?

"Blue Pure 411 Series 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 411 Series Particle + Carbon Filter"

One combined cartridge for Blueair's smallest tower: a particle layer that Blueair describes as capturing "PM 2.5, pollen, dust mite matter allergen, and pet dander allergen", and an activated carbon layer that "traps household odors from smoke and cooking".

Blueair says: "6 months of operation", signalled by a red filter replacement indicator on the unit.

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 411
Blue Pure 411+
Blue Pure 411 Auto

Does NOT fit — commonly confused

Blue Pure 411a, 411i Max and 411i+ — these take the F4MAX filter instead, which Blueair sells as a separate product. One letter of difference in the model name, a different cartridge. This is the wrong order waiting to happen in this family.
The PRE-FILTERS are not interchangeable even within the models this cartridge does fit. Blueair lists a Blue Pure 411 Pre-filter, a Blue Pure 411 Auto Pre-Filter and a Blue Pure 411+ Pre-filter as three separate products. Order the sleeve for your exact unit, not for the series.

Variants Blueair sells

Particle + Carbon Filter — the standard cartridge, and the one to order unless you have a reason not to.
AllergenBlock Filter — same fit, different media formulation.
SmokeBlock Filter — same fit, formulated for smoke.
Blue Pure 411 Pre-filter / 411 Auto Pre-Filter / 411+ Pre-filter — the washable fabric sleeves, sold in several colours. Three separate products for three models: check which one is yours before ordering.

Units we have researched that take this filter: Blueair Blue Pure 411 Auto .

What each part number is

"Blue Pure 411 Series Particle + Carbon Filter": the full product name is the identifier. Blueair prints no SKU on the filter page itself (checked 14-sep-2026), so the name plus the model list is what you match on.

What the manufacturer documents

What is in the set

The useful thing to understand about this family is which part is shared and which is not, because most people assume it the wrong way round. The expensive cartridge is SHARED across the 411 series. The cheap fabric pre-filter is MODEL-SPECIFIC — Blueair sells a different one for the 411, the 411 Auto and the 411+.

How often to change it

"6 months of operation", signalled by a red filter replacement indicator on the unit. Blueair does not publish an hours-per-day assumption behind the figure, so it cannot be scaled arithmetically — but on this range the indicator is doing the counting, and Blueair's stated approach on the sister 511 model is that its algorithm tracks fan speed, running time and measured pollution rather than days.

After fitting a new cartridge the indicator has to be reset by hand: Blueair's instruction is to press the centre button for 7 to 10 seconds, and up to 30 seconds depending on the model.

Blueair’s page for this filter

Resetting the filter indicator

Fit the new cartridge and close the unit fully.
With the unit powered on, press and hold the centre button.
Hold for 7 to 10 seconds — Blueair notes it can take up to 30 seconds depending on the model.
The red filter replacement indicator should go out. If it does not, the hold was not long enough: this is a deliberate long press so it cannot be triggered by accident.

Steps as documented by Blueair. If the light stays on after this, the troubleshooting below covers why.

Genuine vs third-party filters

Blueair publishes no position on third-party filters for this range that we could locate, so none is summarised here. What applies to all of them equally is that no replacement filter in this category carries an independent performance measurement, because none exists — so there is no comparison to report, only the absence of one.

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
The cartridge fits but the fabric sleeve does not.	The cartridge is shared across the 411 series; the pre-filter sleeve is not. Blueair sells a different one for 411, 411 Auto and 411+.	Order the pre-filter that names your exact model. The cartridge and the sleeve are bought separately and follow different compatibility rules.
Ordered a 411 filter for a 411a and it does not fit.	Despite the name, the 411a belongs with the Max range and takes the F4MAX filter.	Check the model plate on the unit. If it reads 411a, 411i Max or 411i+, the F4MAX is the correct product and this cartridge is not.
The red indicator stays on after fitting a new cartridge.	The indicator is a counter and does not clear itself when a filter is swapped.	Hold the centre button for 7 to 10 seconds with the unit running. Blueair notes it can take up to 30 seconds on some models, so a short press will not do it.