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Replacement filter set

GermGuardian Filter E – FLT4100 replacement filter

Filter E (FLT4100) fits GermGuardian AC4100, GermGuardian AC4150BL, GermGuardian AC4150P and GermGuardian AC4175W according to the cited GermGuardian source.

Official manufacturer Filter E FLT4100 Check official GermGuardian availability Non-affiliate link to the cited official product page.
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Quick fit check

Filter E fit and replacement facts

Part numberFLT4100
Compatible models4
Filter roleReplacement filter set

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

Compatible GermGuardian models

Follow a model link for its complete primary, optional, specialty, and alternative filter list.

Model Filter Part number Role Source Marketplace
GermGuardian AC4100 Filter E FLT4100 Replacement filter set Guardian Technologies GermGuardian FLT4100 - Filter E Check prices
GermGuardian AC4150BL Filter E FLT4100 Replacement filter set Guardian Technologies GermGuardian FLT4100 - Filter E Check prices
GermGuardian AC4150P Filter E FLT4100 Replacement filter set Guardian Technologies GermGuardian FLT4100 - Filter E Check prices
GermGuardian AC4175W Filter E FLT4100 Replacement filter set Guardian Technologies GermGuardian FLT4100 - Filter E Check prices

Buying checklist

What to check in a filter listing

Confirm that the listing names part FLT4100 and one of the compatible models: GermGuardian AC4100, GermGuardian AC4150BL, GermGuardian AC4150P and GermGuardian AC4175W. Similar-looking filters are not proof of fit.

Decide whether you want an OEM or aftermarket filter, then compare the included pieces, product photos, seller details, delivery estimate, and total price.

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.

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.

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 2026-07-22. Recheck the listing and your purifier label before ordering.