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Replacement filter set

GermGuardian Filter O – FLT5100 replacement filter

Filter O (FLT5100) fits GermGuardian AC3200, GermGuardian AC3250, GermGuardian AC5109 and GermGuardian AP3250 according to the cited GermGuardian source.

Official manufacturer Filter O FLT5100 Check official GermGuardian availability Non-affiliate link to the cited official product page.
Marketplace search Check eBay prices for FLT5100 Sponsored eBay links. We may earn a commission from qualifying purchases.

Quick fit check

Filter O fit and replacement facts

Part numberFLT5100
Compatible models4
Filter roleReplacement filter set

The cited page describes FLT5100 as a True HEPA and treated-carbon replacement filter but does not state a replacement interval.

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 AC3200 Filter O FLT5100 Replacement filter set Guardian Technologies GermGuardian FLT5100 - Filter O Check prices
GermGuardian AC3250 Filter O FLT5100 Replacement filter set Guardian Technologies GermGuardian FLT5100 - Filter O Check prices
GermGuardian AC5109 Filter O FLT5100 Replacement filter set Guardian Technologies GermGuardian FLT5100 - Filter O Check prices
GermGuardian AP3250 Filter O FLT5100 Replacement filter set Guardian Technologies GermGuardian FLT5100 - Filter O Check prices

Buying checklist

What to check in a filter listing

Confirm that the listing names part FLT5100 and one of the compatible models: GermGuardian AC3200, GermGuardian AC3250, GermGuardian AC5109 and GermGuardian AP3250. 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

The cited page describes FLT5100 as a True HEPA and treated-carbon replacement filter but does not state a replacement interval.

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

Compare compatible options

These filters share at least one officially cited model within the same brand, but may serve a different primary or optional role. Check each part page before buying.

Frequently asked questions

How often should I replace the GermGuardian Filter O (FLT5100)?

The cited page describes FLT5100 as a True HEPA and treated-carbon replacement filter but does not state a replacement interval.

Which GermGuardian models use the Filter O FLT5100?

According to the official GermGuardian product page, Filter O (FLT5100) fits GermGuardian AC3200, GermGuardian AC3250, GermGuardian AC5109 and GermGuardian AP3250. Verify the model label on your unit before ordering.

Do aftermarket FLT5100 filters work?

Marketplace listings may be from the manufacturer or a third party. Match the exact part number FLT5100, review the listing details, and verify the model label on your unit before buying.

Manufacturer source

Official Guardian Technologies product page identifies Filter O, SKU FLT5100, as compatible with models AC3200, AC3250, AC5109 and AP3250.

Guardian Technologies GermGuardian FLT5100 - Filter O

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