Filter Fit FinderGermGuardian · air purifier
GermGuardian AC4100 replacement filter
Use part FLT4100. Replace every 6-8 months depending on use.
The filter that fits
Maker lists this modelGermGuardian Filter E
GermGuardian FLT4100 HEPA PURE Air Purifier Filter E
- Part number
- FLT4100
- How many
- 1 per unit
- How often
- Replace every 6-8 months depending on use
Opens an Amazon search for GermGuardian Filter E FLT4100. Check the listing says FLT4100.
Look-alike models that take a different filter
The AC4825 tower takes Filter B (FLT4825) and the AC4010 takes Filter A (FLT4010).
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 Model AC4100, AC4175, AC4150PCA and AC4150BLCA
- How many guardiantechnologies.com Maker's own page checked Oct 1, 2026
Only one single combination filter needs to be replaced every 6-8 months depending on the use of the product