Model compatibility ledger

GermGuardian AC4825 replacement filter

Use this model page to match the purifier body label to the OEM filter SKU, compatible alternatives, sizing notes, and retailer listings before ordering.

OEM filter SKU

FLT4825

Replacement interval

Every 8 months

Annual filter estimate

$40-$100

OEM filter first

GermGuardian FLT4825 Filter B

Common 22-inch tower purifier.

Model numbers: AC4825, AC4825E
Aliases: GermGuardian 22 inch tower
Dimensions: Filter B size for 22-inch tower purifiers.

Last reviewed 2026-05-29. Match both purifier model and filter SKU because retailers often group similar cartridges together.

OEM and compatible filter comparison

OEM entries are shown first. Compatible alternatives are not manufacturer-approved unless marked OEM.

Check	OEM filter	Compatible option
Manufacturer-recommended filter	FLT4825 · GermGuardian FLT4825 Filter B	FLT4825 · GermGuardian FLT4825 Filter B Filter B size for 22-inch tower purifiers. Annual estimate: $40-$100.

Retailer options for FLT4825

Amazon

GermGuardian FLT4825 filter

Varies by listing

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Availability note: Use the SKU and model notes here to confirm fit before checkout.
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Check retailer listing

Verify the purifier model and filter SKU on the retailer page before ordering.

GermGuardian

FLT4825 Filter B