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GermGuardian air purifier

GermGuardian AC5109 replacement filter

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

Official GermGuardian fit · checked

Same filter, other models

Other GermGuardian purifiers that use Filter O FLT5100

Own more than one purifier? These models share the same official part number.

All compatible GermGuardian AC5109 filters

Every part number below is a primary replacement filter for this model.

Filter Part number Type Price
Filter O FLT5100 Replacement filter set Check price

Price links open sponsored eBay searches for the exact part number.

Before you order

How to buy the right GermGuardian AC5109 filter

  • Confirm the label on your purifier reads AC5109.
  • Make sure the listing names part FLT5100, not just a similar-looking filter.
  • Check the pack size and pieces included. Genuine and third-party filters can differ.
  • Compare the total price with shipping, plus the seller's feedback and delivery estimate.

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.

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.

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

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