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Replacement filter set

GermGuardian Filter E FLT4100 replacement filter

Filter E (part FLT4100) fits GermGuardian AC4100, GermGuardian AC4150BL, GermGuardian AC4150P and GermGuardian AC4175W, according to the official GermGuardian product page.

Official GermGuardian fit · checked

GermGuardian models that use Filter E FLT4100

This filter is listed for 4 models. Open a model to see its complete list of primary, optional, and specialty filters.

Before you order

What to check in a FLT4100 listing

  • The listing names part FLT4100. Similar-looking filters are not proof of fit.
  • Your purifier is one of the compatible models: GermGuardian AC4100, GermGuardian AC4150BL, GermGuardian AC4150P and GermGuardian AC4175W.
  • The pack size and pieces included match what you need. Genuine and third-party filters can differ.
  • The total price with shipping, seller feedback, and delivery estimate work for you.

Care guidance

Replacement schedule

GermGuardian sells this combination True HEPA and activated carbon pre-filter set for tabletop models. Replace every 6 to 8 months.

Usage conditions can affect service life. Follow the cited manufacturer guidance for this part.

Compare compatible options

These share at least one compatible model but may do a different job, such as a carbon pre-filter or a specialty version. Check each part page before buying.

Frequently asked questions

How often should I replace the GermGuardian Filter E (FLT4100)?

GermGuardian sells this combination True HEPA and activated carbon pre-filter set for tabletop models. Replace every 6 to 8 months.

Which GermGuardian models use the Filter E FLT4100?

According to the official GermGuardian product page, Filter E (FLT4100) fits GermGuardian AC4100, GermGuardian AC4150BL, GermGuardian AC4150P and GermGuardian AC4175W. Verify the model label on your unit before ordering.

Do aftermarket FLT4100 filters work?

Marketplace listings may be from the manufacturer or a third party. Match the exact part number FLT4100, review the listing details, and verify the model label on your unit before buying.

Official compatibility record

Manufacturer source

Official Guardian Technologies product page identifies Filter E, SKU FLT4100, as compatible with models AC4100, AC4150BL, AC4150P and AC4175W.

Guardian Technologies GermGuardian FLT4100 - Filter E

Source compatibility checked 2026-08-29. Recheck the listing and your purifier label before ordering.