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GermGuardian · air purifier

GermGuardian AC4825 replacement filter

Use part FLT4825. Replace every 6-8 months depending on use.

The filter that fits

Maker lists this model

GermGuardian Filter B

GermGuardian FLT4825 HEPA PURE Air Purifier Filter B

Part number
FLT4825also sold as FLT4825-01
How many
1 per unitpacks: FLT4825-02 (2), FLT4825-04 (4), FLT4825-12 (12)
How often
Replace every 6-8 months depending on use
Buy Filter B on AmazonManufacturer page

Opens an Amazon search for GermGuardian Filter B FLT4825. Check the listing says FLT4825.

See the sources

Does your exact model share this filter?

GermGuardian labels several versions of the AC4825. Check the label on your unit.

  • AC4825 takes FLT4825
  • AC4825E same filter
  • AC4825W same filter

Look-alike models that take a different filter

The AC4100 takes Filter E (FLT4100), the AC4010 takes Filter A (FLT4010) and the AC5600 takes Filter N (FLT5600).

Other genuine options from GermGuardian

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

  • GermGuardian FLT4825SM SMOKE CLEAR Air Purifier Filter B
    FLT4825SM · Find on Amazon
  • GermGuardian FLT4825VO TOXIN CLEAR Replacement Filter B
    FLT4825VO · Find on Amazon
  • GermGuardian FLT4850PT PET PURE Air Purifier Filter B
    FLT4850PT · Find on Amazon
  • GermGuardian FLT22CB4 GENUINE Carbon Filter Replacements for 22" Air Purifiers (4 count)
    FLT22CB4 · Find on Amazon

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 guardiantechnologies.com Maker's own page checked Oct 1, 2026
    Replacement filter for GermGuardian Air Purifier Models AC4825E, AC4825W, AC4870, AC4820, AC4880, AC4300BPTCA, AC4300WPT, AC4900CA, AC4850PT, CDAP4500BCA, CDAP4500WCA, PureGuardian Model AP2200CA and Black+Decker BXAP150
  • How many guardiantechnologies.com Maker's own page checked Oct 1, 2026
    Page for the AC4825 (per its URL): Number of Filters Included 1 ... Accessories Included Tower Air Purifier, HEPA Filter, UVC Bulb, User Manual
  • How often guardiantechnologies.com Maker's own page checked Oct 1, 2026
    GermGuardian air purifier filters should be replaced every 6–8 months depending on use.
  • What's in it guardiantechnologies.com Maker's own page checked Oct 1, 2026
    REDUCES ODORS - The activated carbon pre-filter traps dust, pet hair, and other large particles, while extending the life of the HEPA filter.
  • Packs guardiantechnologies.com Maker's own page checked Oct 1, 2026
    variants FLT4825-01: 1 pack, FLT4825-02: 2 pack, FLT4825-04: 4 pack, FLT4825-12: 12 pack
Show all 8 sources

Which filter fits

  1. guardiantechnologies.com Maker's own page checked Oct 1, 2026
    Replacement filter for GermGuardian Air Purifier Models AC4825E, AC4825W, AC4870, AC4820, AC4880, AC4300BPTCA, AC4300WPT, AC4900CA, AC4850PT, CDAP4500BCA, CDAP4500WCA, PureGuardian Model AP2200CA and Black+Decker BXAP150
  2. guardiantechnologies.com Maker's own page checked Oct 1, 2026
    GermGuardian AC4825 HEPA PURE 22" Tower Air Purifier ... Add Your Replacement Filter Filter B | FLT4825
  3. guardiantechnologies.com Maker's own page checked Oct 1, 2026
    Replacement filter for GermGuardian Air Purifier Models AC4825E, AC4825W, ... PureGuardian Model AP2200CA and Black+Decker BXAP150
  4. guardiantechnologies.com Maker's own page checked Oct 1, 2026
    PureGuardian AP2200 HEPA PURE 22" Tower Air Purifier ... Model Compatibility FLT4825, FLT4825SM, FLT4825VO, FLT22CB4

How many

  1. guardiantechnologies.com Maker's own page checked Oct 1, 2026
    Page for the AC4825 (per its URL): Number of Filters Included 1 ... Accessories Included Tower Air Purifier, HEPA Filter, UVC Bulb, User Manual

How often

  1. guardiantechnologies.com Maker's own page checked Oct 1, 2026
    GermGuardian air purifier filters should be replaced every 6–8 months depending on use.

What's in it

  1. guardiantechnologies.com Maker's own page checked Oct 1, 2026
    REDUCES ODORS - The activated carbon pre-filter traps dust, pet hair, and other large particles, while extending the life of the HEPA filter.

Packs

  1. guardiantechnologies.com Maker's own page checked Oct 1, 2026
    variants FLT4825-01: 1 pack, FLT4825-02: 2 pack, FLT4825-04: 4 pack, FLT4825-12: 12 pack