Air purifier filter · Blueair
Blueair Particle + Carbon filter (Blue Pure 121)
- Replace every 6 months
- Fits inside the fridge
- Fits 1 model
The standard main filter for the Blue Pure 121: a pleated particle filter with an activated-carbon layer in one drop-in cylinder. Blueair's AllergenBlock and SmokeBlock filters fit the same slot if you want an allergy- or smoke-focused alternative.
Reduces
- Fine dust, pollen and allergens
- Odours, smoke and gases (activated carbon)
- Fits
- Blue Pure 121
- Lasts
- 6 months (filter light)
Every number this part goes by
- Retail name:
- 104507
- Retail name:
- 121 filter
Where to buy
Every seller we track for this part, cheapest first. Genuine is the manufacturer's own part; compatible is a third-party filter made to fit. Prices are re-checked daily where the seller publishes them. Last checked 1 August 2026.
How long it lasts
Replace every 6 months — the appliance's filter light tells you when.
After fitting: Press and hold the button until the filter light goes out (about 5 seconds).
Flow slows and taste drops off as the filter fills up. Changing on time is the whole point of the filter.
Not due yet?
This filter is due every 6 months. We'll email you when it's time — free, no spam.
Fitting it
A few minutes, no tools. Watch it done, then follow the steps.
- 1Switch the purifier off and unplug it.
- 2Lift the top section straight up off the base.
- 3Lift the old cylindrical filter out, unwrap the new one and drop it in.
- 4Refit the top, plug in, and hold the button until the filter light goes out.
Will it fit your appliance?
Type your model number and we'll check it against our fitment database.
Fits these models
Blueair1 model
Common questions
- Which filter fits the Blueair F121PACF104507?
- The Blueair F121PACF104507 takes the Blueair Particle + Carbon filter (Blue Pure 121) (part F121PACF104507). Compatible filters made to the same specification also fit.
- How often should I replace the filter in my Blueair F121PACF104507?
- Every 6 months. Flow slows and performance drops off as the filter fills up, so it's worth doing on time.
- Where can I buy the F121PACF104507 in Australia?
- We track 1 Australian seller for the F121PACF104507; the lowest listed price when we last checked was A$94.99 at blueair-au. Prices are re-checked daily and dated on this page.
- How do I fit the F121PACF104507 in a Blueair F121PACF104507?
- No tools, a few minutes: 4 steps, listed on this page with the replacement video where the maker has one.
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