Fits checked Oct 1, 2026 · How we check
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Blueair · air purifier

Blueair Classic 503 replacement filter

Use part 501PFK. Lasts up to 9 months depending on usage.

The filter that fits

Maker lists this model

Blueair Classic 500/600 Series Particle Filter

Classic 500/600 Series Particle Filter

Part number
501PFK
How many
1 per unit
How often
Lasts up to 9 months depending on usage

Blueair sells this filter as a set of 3 and does not state how many filters or sets the unit holds; the count of one (one set) is not stated by the maker.

Buy Classic 500/600 Series Particle Filter on AmazonManufacturer page

Opens an Amazon search for Blueair Classic 500/600 Series Particle Filter 501PFK. Check the listing says 501PFK.

See the sources

Does your exact model share this filter?

Blueair labels several versions of the Classic 503. Check the label on your unit.

  • Classic 503 takes 501PFK
  • 501 same filter
  • 505 same filter
  • 510 same filter
  • 550E same filter
  • 555EB same filter
  • 580i same filter
  • 601 same filter
  • 603 same filter
  • 605 same filter
  • 650E same filter
  • 680i same filter

Look-alike models that take a different filter

The Classic 200 series takes 201PF and the Classic 400 series takes 402PF.

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
    This filter is compatible with the following Classic family models: 501, 503, 505, 510, 550E, 555EB, 580i, 601, 603, 605, 650E and 680i.
  • How often blueair.com Maker's own page checked Oct 1, 2026
    Depending on usage, your filter will last up to 9 months.
Show all 3 sources

Which filter fits

  1. blueair.com Maker's own page checked Oct 1, 2026
    This filter is compatible with the following Classic family models: 501, 503, 505, 510, 550E, 555EB, 580i, 601, 603, 605, 650E and 680i.
  2. blueair.com Maker's own page checked Oct 1, 2026
    Classic 500/600 Series Particle Filter, sku 501PFK: "Blueair 500 and 600 Series Particle Filter with Carbon Sheet set of 3"

How often

  1. blueair.com Maker's own page checked Oct 1, 2026
    Depending on usage, your filter will last up to 9 months.