Air Filter LookupAir purifier filter finder

GermGuardian model lookup

GermGuardian AC5109 replacement filter

GermGuardian AC5109 uses Filter O (part FLT5100) as its primary replacement filter set.

Quick fit check

Match the exact filter before buying

The official manufacturer source identifies these primary parts for the GermGuardian AC5109.

Replacement filter set Filter O FLT5100
View part details Official GermGuardian source

All compatible part numbers

Primary, optional, specialty, and alternative filters are listed separately so you can match the role as well as the part number.

Filter Part number Role Source
Filter O FLT5100 Replacement filter set Guardian Technologies GermGuardian FLT5100 - Filter O

Official compatibility record

Manufacturer evidence

Each compatibility and care statement below is reproduced from the cited official manufacturer record. Check the source again before ordering.

Filter O FLT5100

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

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

Buying checklist

How to choose the right replacement

Match the GermGuardian AC5109 model label and the exact part number above. Marketplace listings can be OEM or aftermarket, and a similar-looking filter may have different dimensions.

Compare the listing title, product photos, included filter pieces, seller details, delivery estimate, and total price before you order.

Care guidance

Replacement schedule

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

Usage and air quality can affect service life. Follow the cited manufacturer guidance for each part.

Keep browsing

Frequently asked questions

What filter does the GermGuardian AC5109 use?

The GermGuardian AC5109 uses Filter O (FLT5100). Each part number on this page is backed by an official GermGuardian source.

How often should I replace the GermGuardian AC5109 filter?

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

Where can I check replacement filters for the GermGuardian AC5109?

This page links directly to the cited official GermGuardian product page and shows sponsored individual eBay listings when a fresh exact-part snapshot is available, with an exact-part eBay search fallback. This site does not sell filters; match the part number and review the current source or seller listing before buying.