Air Filter LookupAir purifier filter finder

Specialty replacement filter set

GermGuardian Filter B Cannabis Smoke FLT420B replacement filter

Filter B Cannabis Smoke (part FLT420B) 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 Cannabis Smoke FLT420B

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 FLT420B listing

  • The listing names part FLT420B. 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

The cited page describes FLT420B as a cannabis-smoke replacement filter but does not state a replacement interval.

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 Cannabis Smoke (FLT420B)?

The cited page describes FLT420B as a cannabis-smoke replacement filter but does not state a replacement interval.

Which GermGuardian models use the Filter B Cannabis Smoke FLT420B?

According to the official GermGuardian product page, Filter B Cannabis Smoke (FLT420B) fits GermGuardian AC4300, GermGuardian AC4820, GermGuardian AC4825 and 6 more models. Verify the model label on your unit before ordering.

Do aftermarket FLT420B filters work?

Marketplace listings may be from the manufacturer or a third party. Match the exact part number FLT420B, 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 Cannabis Smoke, SKU FLT420B, as compatible with models AC4300, AC4820, AC4825, AC4850PT, AC4870, AC4880, AC4900, AP2200CA and CDAP4500.

Guardian Technologies GermGuardian FLT420B - Filter B Cannabis Smoke

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