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Specialty replacement filter set

GermGuardian Filter B SMOKE CLEAR FLT4825SM replacement filter

Filter B SMOKE CLEAR (part FLT4825SM) fits GermGuardian AC4300, GermGuardian AC4820, GermGuardian AC4825 and 6 more models, according to the official GermGuardian product page.

Official GermGuardian fit · checked

GermGuardian models that use Filter B SMOKE CLEAR FLT4825SM

This filter is listed for 9 models. Open a model to see its complete list of primary, optional, and specialty filters.

Before you order

What to check in a FLT4825SM listing

  • The listing names part FLT4825SM. Similar-looking filters are not proof of fit.
  • Your purifier is one of the compatible models: GermGuardian AC4300, GermGuardian AC4820, GermGuardian AC4825 and 6 more models.
  • 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

GermGuardian recommends replacing the Smoke Clear HEPA filter set every 6 months. Carbon pre-filters (FLT22CB4) can be replaced every 2 to 3 months.

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

Compare compatible options

These share at least one compatible model but may do a different job, such as a carbon pre-filter or a specialty version. Check each part page before buying.

Replacement filter set

Filter B

FLT4825

Frequently asked questions

How often should I replace the GermGuardian Filter B SMOKE CLEAR (FLT4825SM)?

GermGuardian recommends replacing the Smoke Clear HEPA filter set every 6 months. Carbon pre-filters (FLT22CB4) can be replaced every 2 to 3 months.

Which GermGuardian models use the Filter B SMOKE CLEAR FLT4825SM?

According to the official GermGuardian product page, Filter B SMOKE CLEAR (FLT4825SM) fits GermGuardian AC4300, GermGuardian AC4820, GermGuardian AC4825 and 6 more models. Verify the model label on your unit before ordering.

Do aftermarket FLT4825SM filters work?

Marketplace listings may be from the manufacturer or a third party. Match the exact part number FLT4825SM, 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 B SMOKE CLEAR, SKU FLT4825SM, as compatible with models AC4300, AC4820, AC4825, AC4850PT, AC4870, AC4880, AC4900, AP2200CA and CDAP4500.

Guardian Technologies GermGuardian FLT4825SM - Filter B SMOKE CLEAR

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