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GermGuardian AC5109W replacement filter

GermGuardian AC5109W uses Filter O Carbon Replacement Filters (4-Pack) (part FLT51CB4) as its primary replacement filter set.

GermGuardian AC5109W filter match

Replacement carbon pre-filter pack Filter O Carbon Replacement Filters (4-Pack) FLT51CB4
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View part details Official GermGuardian source

Cited package contents

Package details below come from the linked official source; recheck it before buying.

Filter O Carbon Replacement Filters (4-Pack) FLT51CB4

All compatible part numbers

Primary filters are listed first. Specialty, optional, and alternative filters are compatible options, not required add-ons.

Filter Part number Role Source Marketplace
Filter O Carbon Replacement Filters (4-Pack) FLT51CB4 Replacement carbon pre-filter pack Guardian Technologies GermGuardian FLT51CB4 - Filter O Carbon 4-Pack Check prices
Filter O PET PURE FLT5100PT Specialty replacement filter set Guardian Technologies GermGuardian FLT5100PT - Filter O PET PURE Check prices
Filter O SMOKE CLEAR FLT5100SM Specialty replacement filter set Guardian Technologies GermGuardian FLT5100SM - Filter O SMOKE CLEAR Check prices
Filter O TOXIN CLEAR FLT5100VO Specialty replacement filter set Guardian Technologies GermGuardian FLT5100VO - Filter O TOXIN CLEAR Check prices

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 Carbon Replacement Filters (4-Pack) FLT51CB4

Official Guardian Technologies product page identifies Filter O carbon replacement filter 4-pack, SKU FLT51CB4, as compatible with models AC3200, AC3250, AC5109W and AP3250.

Source checked
Replacement guidance
GermGuardian recommends replacing the activated carbon filter layer every 2 to 3 months depending on use. Package contains 4 carbon replacement filters.
Guidance checked

Filter O PET PURE FLT5100PT

Official Guardian Technologies product page identifies Filter O PET PURE, SKU FLT5100PT, as compatible with models AC3200, AC3250, AC5109W and AP3250.

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Replacement guidance
GermGuardian recommends replacing the Pet Pure HEPA filter set every 6 months. Carbon filters (FLT28CB4) can be replaced every 2 to 3 months.
Guidance checked

Filter O SMOKE CLEAR FLT5100SM

Official Guardian Technologies product page identifies Filter O SMOKE CLEAR, SKU FLT5100SM, as compatible with models AC3200, AC3250, AC5109W and AP3250.

Source checked
Replacement guidance
GermGuardian recommends replacing the Smoke Clear HEPA filter set every 6 months. Carbon filters (FLT28CB4) can be replaced every 2 to 3 months.
Guidance checked

Filter O TOXIN CLEAR FLT5100VO

Official Guardian Technologies product page identifies Filter O TOXIN CLEAR, SKU FLT5100VO, as compatible with models AC3200, AC3250, AC5109W and AP3250.

Source checked
Replacement guidance
GermGuardian recommends replacing the Toxin Clear HEPA filter set every 6 months. Carbon filters (FLT28CB4) can be replaced every 2 to 3 months.
Guidance checked

Buying checklist

How to choose the right replacement

Match the GermGuardian AC5109W 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 Carbon Replacement Filters (4-Pack) FLT51CB4: GermGuardian recommends replacing the activated carbon filter layer every 2 to 3 months depending on use. Package contains 4 carbon replacement filters.

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

Optional calendar tool

Plan your next filter change

Choose a date to download a calendar reminder based on the cited replacement guidance.

Filter O Carbon Replacement Filters (4-Pack) filter set FLT51CB4

The calendar reminder starts 3 months after this date and repeats on that schedule.

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Frequently asked questions

What filter does the GermGuardian AC5109W use?

The GermGuardian AC5109W uses Filter O Carbon Replacement Filters (4-Pack) (FLT51CB4) as its primary replacement filter parts. It also has these optional, specialty, or alternative compatible parts: Filter O PET PURE (FLT5100PT), Filter O SMOKE CLEAR (FLT5100SM), Filter O TOXIN CLEAR (FLT5100VO). Those parts are not simultaneously required primary filters.

How often should I replace the GermGuardian AC5109W filter?

GermGuardian recommends replacing the activated carbon filter layer every 2 to 3 months depending on use. Package contains 4 carbon replacement filters.

Where can I check replacement filters for the GermGuardian AC5109W?

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.