Air Filter LookupAir purifier filter finder

Specialty replacement filter set

GermGuardian Filter B SMOKE CLEAR – FLT4825SM replacement filter

Filter B SMOKE CLEAR (FLT4825SM) fits GermGuardian AC4300, GermGuardian AC4820, GermGuardian AC4825 and 5 more models according to the cited GermGuardian source.

Official manufacturer Filter B SMOKE CLEAR FLT4825SM Check official GermGuardian availability Non-affiliate link to the cited official product page.
Marketplace search Check eBay prices for FLT4825SM Sponsored eBay links. We may earn a commission from qualifying purchases.

Quick fit check

Filter B SMOKE CLEAR fit and replacement facts

Part numberFLT4825SM
Compatible models8
Filter roleSpecialty replacement filter set

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

Compatible GermGuardian models

Follow a model link for its complete primary, optional, specialty, and alternative filter list.

Model Filter Part number Role Source Marketplace
GermGuardian AC4300 Filter B SMOKE CLEAR FLT4825SM Specialty replacement filter set Guardian Technologies GermGuardian FLT4825SM - Filter B SMOKE CLEAR Check prices
GermGuardian AC4820 Filter B SMOKE CLEAR FLT4825SM Specialty replacement filter set Guardian Technologies GermGuardian FLT4825SM - Filter B SMOKE CLEAR Check prices
GermGuardian AC4825 Filter B SMOKE CLEAR FLT4825SM Specialty replacement filter set Guardian Technologies GermGuardian FLT4825SM - Filter B SMOKE CLEAR Check prices
GermGuardian AC4850PT Filter B SMOKE CLEAR FLT4825SM Specialty replacement filter set Guardian Technologies GermGuardian FLT4825SM - Filter B SMOKE CLEAR Check prices
GermGuardian AC4870 Filter B SMOKE CLEAR FLT4825SM Specialty replacement filter set Guardian Technologies GermGuardian FLT4825SM - Filter B SMOKE CLEAR Check prices
GermGuardian AC4880 Filter B SMOKE CLEAR FLT4825SM Specialty replacement filter set Guardian Technologies GermGuardian FLT4825SM - Filter B SMOKE CLEAR Check prices
GermGuardian AC4900 Filter B SMOKE CLEAR FLT4825SM Specialty replacement filter set Guardian Technologies GermGuardian FLT4825SM - Filter B SMOKE CLEAR Check prices
GermGuardian CDAP4500 Filter B SMOKE CLEAR FLT4825SM Specialty replacement filter set Guardian Technologies GermGuardian FLT4825SM - Filter B SMOKE CLEAR Check prices

Buying checklist

What to check in a filter listing

Confirm that the listing names part FLT4825SM and one of the compatible models: GermGuardian AC4300, GermGuardian AC4820, GermGuardian AC4825 and 5 more models. Similar-looking filters are not proof of fit.

Decide whether you want an OEM or aftermarket filter, then compare the included pieces, product photos, seller details, delivery estimate, and total price.

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 filters share at least one officially cited model within the same brand, but may serve a different primary or optional role. Check each part page before buying.

Filter B

FLT4825

Replacement filter set

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 5 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.

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 and CDAP4500.

Guardian Technologies GermGuardian FLT4825SM - Filter B SMOKE CLEAR

Source compatibility checked 2026-07-22. Recheck the listing and your purifier label before ordering.