GermGuardian AC4825E Review: A Cheap Tower for Small Rooms

GermGuardian AC4825 AHAM figures

The AHAM Verifide directory lists the AC4825W and AC4825E at 99 cfm for smoke, 116 for dust and 129 for pollen, with a PM2.5 CADR of 111 and a suggested room size of 153 sq ft. GermGuardian's product page gives 99 smoke and 118 dust, and describes the room size as 153 sq ft cleaned every 12.5 minutes, or 743 sq ft once an hour.

Air changes per hour from 99 cfm smoke CADR, 8 ft ceilings.

Room	Floor area	Air changes an hour
Small office, 9 x 10 ft	90 sq ft	8.3
Guest room, 10 x 12 ft	120 sq ft	6.2
AHAM room size	153 sq ft	4.9
Bedroom, 12 x 16 ft	192 sq ft	3.9
Living room, 15 x 20 ft	300 sq ft	2.5

AHAM puts its annual energy use at 182 kWh with an integrated energy factor of 3.5, which is low efficiency: the Levoit Core 400S-P scores 5.8 and the Blueair 211i Max 9.0. In money, 182 kWh a year at 17.2 cents per kWh, the 2025 US residential average from the EIA, is about $31.

Filters and the UV-C bulb

GermGuardian lists three replaceable parts on its product page:

• HEPA Filter B (FLT4825, with SMOKE CLEAR, TOXIN CLEAR and pet variants), which GermGuardian says to replace every 6 to 8 months depending on use.
• Carbon pre-filters (FLT22CB4, four to a pack), replaced every 2 to 3 months.
• UV-C bulb (LB4000).

The UV-C bulb shines on air passing through the unit and is meant to work on germs. The EPA's guidance on air cleaners notes that UV in portable purifiers may not hold air long enough to have a meaningful effect on airborne microorganisms; what the AHAM CADR measures is particle removal by the fan and filter. You can run the AC4825 with the UV-C switched off and lose nothing in CADR, and doing so saves replacing the bulb. We did not find the AC4825 by name in the parts of California's certified air cleaner list we read, so check the label on the unit if certification matters to you.

What a year of upkeep looks like

At GermGuardian's intervals, a year means about two Filter B HEPA filters and one or two packs of carbon pre-filters, plus a UV-C bulb if you use it. Genuine Filter B is one of the least expensive HEPA filters for any AHAM-listed purifier, which is the AC4825's main selling point beside its purchase price.

GermGuardian AC4825 vs the alternatives

AHAM Verifide figures, read November 3, 2026.

Model	Smoke CADR	Room size	Integrated energy factor
GermGuardian AC4825E	99 cfm	153 sq ft	3.5
Levoit Core 300	143 cfm	222 sq ft	2.7
Blueair Blue Pure 411i Max	145 cfm	225 sq ft	8.2
Levoit Core 200S-P	90 cfm	140 sq ft	2.2 to 2.3

Who should buy the GermGuardian AC4825E

• Buy it for a room of 150 sq ft or less when price is the deciding factor.
• Buy it if you like a slim tower that fits beside a bed or desk.
• Skip it for a standard main bedroom; the Levoit Core 300-P or Blueair 411i Max have about 45% more certified airflow.
• Skip it if you were buying it for the UV-C; that feature is not what cleans the air in AHAM's test.

See our best purifiers under $200 and small-space picks for alternatives.