Fits checked Oct 1, 2026 · How we check
Filter Fit Finder
Menu

Blueair · air purifier

Blueair Blue Pure 121 replacement filter

Use part F121PACF104507. Replacement indicator lights after about 6 months of operation.

The filter that fits

Maker lists this model

Blueair 121 Particle + Carbon Filter

Blue Pure 121 Particle + Carbon Filter

Part number
F121PACF104507
How many
1 per unit
How often
Replacement indicator lights after about 6 months of operation

Blueair does not state how many of these filters the unit holds; the count of one shown here is not stated by the maker.

Buy 121 Particle + Carbon Filter on AmazonManufacturer page

Opens an Amazon search for Blueair 121 Particle + Carbon Filter F121PACF104507. Check the listing says F121PACF104507.

See the sources

Other genuine options from Blueair

Variants and kits the maker sells for this model. Same fit, different media or packaging.

Sources

High confidence: the manufacturer names this exact model on a live page. Each line is the page we read and the day we read it.

  • Which filter fits blueair.com Maker's own page checked Oct 1, 2026
    Compatible with Blue Pure 121 ... This filter is compatible with the Blue Pure 121 air purifier.
  • How often blueair.com Maker's own page checked Oct 1, 2026
    A red filter replacement indicator appears on the air purifier when it is time to change filter, after about 6 months of operation.
  • What's in it blueair.com Maker's own page checked Oct 1, 2026
    Main filter captures dust mite matter allergen & pet dander allergen ... Activated Carbon Traps light household odors from smoke, cooking odors and more
  • Other genuine options blueair.com Maker's own page checked Oct 1, 2026
    Blue Pure 121 Filter Extra Protection Compatible with Blue Pure 121 ... features highly-porous, activated carbon pellets for extra protection against harmful gaseous pollutants
Show all 5 sources

Which filter fits

  1. blueair.com Maker's own page checked Oct 1, 2026
    Compatible with Blue Pure 121 ... This filter is compatible with the Blue Pure 121 air purifier.
  2. blueair.com Maker's own page checked Oct 1, 2026
    Blue Pure 121 Particle + Carbon Filter, sku F121PACF104507

How often

  1. blueair.com Maker's own page checked Oct 1, 2026
    A red filter replacement indicator appears on the air purifier when it is time to change filter, after about 6 months of operation.

What's in it

  1. blueair.com Maker's own page checked Oct 1, 2026
    Main filter captures dust mite matter allergen & pet dander allergen ... Activated Carbon Traps light household odors from smoke, cooking odors and more

Other genuine options

  1. blueair.com Maker's own page checked Oct 1, 2026
    Blue Pure 121 Filter Extra Protection Compatible with Blue Pure 121 ... features highly-porous, activated carbon pellets for extra protection against harmful gaseous pollutants