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

Winix C909 replacement filter

Use part 115115. Replace True HEPA every 12 months; carbon filter every 3 months.

The filter that fits

Maker lists this model

Winix Filter A

Winix Replacement Filter A

Part number
115115
How many
1 per unit
How often
Replace True HEPA every 12 months; carbon filter every 3 months
Buy Filter A on AmazonManufacturer page

Opens an Amazon search for Winix Filter A 115115. Check the listing says 115115.

See the sources

Look-alike models that take a different filter

The C545 (Filter S) and C610 (Filter Z) take different filters.

Other genuine options from Winix

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 winixamerica.com Maker's own page checked Oct 1, 2026
    Filter A – 115115: Compatible with Winix air cleaner models 6300, P300, 5300, 5500, 5300-2, 6300-2, AM90, C909, 9800 and C535
  • How often winixamerica.com Maker's own page checked Oct 1, 2026
    change the True HEPA Filter once every 12 months and the Carbon Filter once every 3 months
  • What's in it winixamerica.com Maker's own page checked Oct 1, 2026
    True HEPA Filter: Captures 99.99% ... Activated Carbon Filters (4-pack): Reduces VOCs and household odors
  • Other genuine options winixamerica.com Maker's own page checked Oct 1, 2026
    Filter A +PetGuard 1712-0004-12, +AllergenGuard 1712-0004-10, +SmokeGuard 1712-0004-11: each Compatible with Winix air cleaner models 6300, P300, 5300, 5500, 5300-2, 6300-2, AM90, C909, 9800 and C535
Show all 6 sources

Which filter fits

  1. winixamerica.com Maker's own page checked Oct 1, 2026
    Filter A – 115115: Compatible with Winix air cleaner models 6300, P300, 5300, 5500, 5300-2, 6300-2, AM90, C909, 9800 and C535
  2. winixeurope.eu Maker's own page checked Oct 1, 2026
    Air Purifier WINIX Filter A ... for the air purifiers WINIX ZERO, WINIX 5300-2 and the WINIX P300

How often

  1. winixamerica.com Maker's own page checked Oct 1, 2026
    change the True HEPA Filter once every 12 months and the Carbon Filter once every 3 months

What's in it

  1. winixamerica.com Maker's own page checked Oct 1, 2026
    True HEPA Filter: Captures 99.99% ... Activated Carbon Filters (4-pack): Reduces VOCs and household odors

Other genuine options

  1. winixamerica.com Maker's own page checked Oct 1, 2026
    Filter A +PetGuard 1712-0004-12, +AllergenGuard 1712-0004-10, +SmokeGuard 1712-0004-11: each Compatible with Winix air cleaner models 6300, P300, 5300, 5500, 5300-2, 6300-2, AM90, C909, 9800 and C535
  2. winixamerica.com Maker's own page checked Oct 1, 2026
    Filter U – 1712-0094-00: Compatible with Winix air cleaner model HR900, HR950, HR951, HR1000, 5300-2, 5500-2, 6300-2, C535, C555