Air Filter LookupAir purifier filter finder

Replacement filter set

GermGuardian Filter K FLT9400 replacement filter

Filter K (part FLT9400) fits GermGuardian AC9400W, according to the official GermGuardian product page.

Official GermGuardian fit · checked

GermGuardian models that use Filter K FLT9400

This filter is listed for one model. Open a model to see its complete list of primary, optional, and specialty filters.

Before you order

What to check in a FLT9400 listing

  • The listing names part FLT9400. Similar-looking filters are not proof of fit.
  • Your purifier is one of the compatible models: GermGuardian AC9400W.
  • The pack size and pieces included match what you need. Genuine and third-party filters can differ.
  • The total price with shipping, seller feedback, and delivery estimate work for you.

Care guidance

Replacement schedule

The cited page describes FLT9400 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.

Frequently asked questions

How often should I replace the GermGuardian Filter K (FLT9400)?

The cited page describes FLT9400 as a True HEPA and treated-carbon replacement filter but does not state a replacement interval.

Which GermGuardian models use the Filter K FLT9400?

According to the official GermGuardian product page, Filter K (FLT9400) fits GermGuardian AC9400W. Verify the model label on your unit before ordering.

Do aftermarket FLT9400 filters work?

Marketplace listings may be from the manufacturer or a third party. Match the exact part number FLT9400, review the listing details, and verify the model label on your unit before buying.

Official compatibility record

Manufacturer source

Official Guardian Technologies product page identifies Filter K, SKU FLT9400, as compatible with model AC9400W.

Guardian Technologies GermGuardian FLT9400 - Filter K

Source compatibility checked 2026-08-29. Recheck the listing and your purifier label before ordering.