Which models does the Blueair Blue Pure 511 replacement filter fit?

It fits Blueair Blue Pure 511. It does not fit Blueair Blue Pure 511i Max — a different unit despite the shared 511 in the name. Blueair sells it a different main filter, the "F5MAX Replacement PAC filter for 511i Max", and a different fabric pre-filter. This is the single most likely wrong order in this family..

Blueair Blue Pure 511 replacement filter

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

The part you need

110009

A single combined cartridge that Blueair sells as the "Blue Pure 511 Particle + Carbon Filter".

Blueair says: Approximately 6 months of operation — but Blueair is unusually specific about why that is an approximation, and it is worth reading.

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

Blueair Blue Pure 511

Does NOT fit — commonly confused

Blueair Blue Pure 511i Max — a different unit despite the shared 511 in the name. Blueair sells it a different main filter, the "F5MAX Replacement PAC filter for 511i Max", and a different fabric pre-filter. This is the single most likely wrong order in this family.

Variants Blueair sells

Blue Pure 511 Pre-filter — a separate accessory, not part of the main cartridge. Blueair describes these as "washable fabric pre-filters" that catch "large airborne particles such as dust, lint, pollen, and pet hair", and sells them in several colours. Because it is washable, it is the part of this system that costs nothing to maintain, and cleaning it is what protects the cartridge you do pay for.

Units we have researched that take this filter: Blueair Blue Pure 511 .

What each part number is

110009: the code Blueair's own store carries for the "Blue Pure 511 Particle + Carbon Filter", together with UPC 689122023199. The product page for the filter itself does not print a SKU anywhere in its copy, so this identifier comes from Blueair's store product data rather than from the page you land on.

What the manufacturer documents

What is in the set

A single combined cartridge that Blueair sells as the "Blue Pure 511 Particle + Carbon Filter". It carries two functions in one piece: a particle layer that Blueair describes as capturing "airborne particles including, PM 2.5, pollen, dust mite matter allergen & pet dander allergen", and an activated carbon layer rated by Blueair for "light household odors from smoke, cooking odors and more". Note the word Blueair chose there: LIGHT household odors. It is a thin carbon element inside a combined cartridge, not a packed carbon stage, and the manufacturer's own wording is the most honest guide to what it will and will not do.

The washable fabric pre-filter is NOT part of this cartridge. It is a separate product, and on this unit it is the sleeve that wraps the outside of the machine.

How often to change it

Approximately 6 months of operation — but Blueair is unusually specific about why that is an approximation, and it is worth reading. Its filter page states that "Blueair's proprietary RealTrack algorithm accurately calculates the remaining filter lifetime based on fan speed, usage time and pollution levels". In other words the manufacturer is saying outright that the interval depends on how hard the unit has worked and in what air, and that the machine, not the calendar, is tracking it. That is the usage assumption most listings hide; here it is the stated mechanism.

What Blueair does NOT state on the filter page is an hours-per-day figure behind the 6 months, so the number cannot be scaled by hand. Treat the indicator as the authority on this unit and the 6 months as a planning figure.

Blueair’s page for this filter

Genuine vs third-party filters

Blueair does not publish a position on third-party filters for this model that we could locate, so we are not going to summarise one. What can be said is what is absent on the other side: no third-party filter for this unit carries an independent performance measurement, because none exists for replacement filters in this category at all. That absence applies to every aftermarket option equally, and it is the reason we cannot tell you how one performs.

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 filter indicator reappears sooner than six months.	This is the RealTrack algorithm doing what Blueair says it does: it counts fan speed, running time and measured pollution rather than days. A unit running hard, or in dirty air, reaches the end of a filter's useful life sooner, and the machine knows that before a calendar would.	Treat the indicator as correct rather than early. If it is arriving much sooner than expected, the informative question is what changed in the room — a new pet, a window onto traffic, a season — rather than whether the unit is faulty.
A new cartridge gives off a smell for the first day or two.	Carbon and the adhesives used in filter construction off-gas when new. It is documented behaviour across brands rather than a defect.	Run the unit and give it a few days. A smell that is still there after that is not off-gassing and is worth investigating separately.
The fabric sleeve is filthy and airflow has dropped.	The pre-filter is the outer fabric on this unit, it loads first, and being on the outside it is the easiest part to forget precisely because it does not look like a filter.	Wash it. Blueair calls these washable fabric pre-filters, which is the whole point of them: the sleeve is the part you maintain so the cartridge lasts. Blueair does not publish a washing method or a frequency on the pre-filter page, so follow the instructions supplied with your unit.