GermGuardian AC4825E

GermGuardian AC4825E

By GermGuardian · Air Purifiers · Home & Workspace

  • AHAM Verifide CADR: 99 CFM smoke, 118 CFM dust, 125 CFM pollen
  • 40 dBA on low speed, 55 dBA on high speed
  • 22.00 in high x 10.25 in wide x 6.75 in deep, 8.55 lb, 120 V, 3 fan speeds

Lowest price seen
~$99.99 (approx.)
from $99.99 at Amazon

Prices are snapshots. Check the current price with the store.

Problems, parts and running costs

Summary

The GermGuardian AC4825E is a narrow 22-inch tower air purifier with a manual three-speed knob and a pre-filter plus True HEPA filter, built for a bedroom, dorm or small office rather than a whole room. Check the room size before buying: the “743 square feet” line is an hourly throughput claim, and independent sizing lands nearer 150-170 square feet.

Strengths

  • Measured 92% particle reduction in 60 minutes at high speed in a 194 sq. ft. room.
  • A 3-year limited warranty and a documented, inexpensive genuine-filter path.
  • No sensor, app or auto mode to fail.
  • Narrow 6.75-inch-deep footprint fits a corner or a bedside.
  • Carrying handle and simple rear-access filter changes.
  • Owners report less dust on furniture and less cigarette-smoke odor indoors.

Weaknesses

  • Low-speed noise measures 46.7 dBA, above the 40 dBA claim and louder than several rivals.
  • Consumer Reports calls particle removal mediocre at high speed and worse at low speed.
  • Two genuine filters a year cost about $50; electricity estimates range from $41 to $70 a year.
  • The UV-C bulb sits at the top of the unit, and one review questions whether air gets enough exposure to matter.
  • No motor, board or fan parts are documented, and one owner’s unit runs with all indicator lights dead and no resolution.
  • Odor performance depends on the separate carbon pre-filter as well as the HEPA filter.

Verified specifications

ModelAC4825E (black); the white AC4825W and gray AC4825DLX share the same published platform.
Power120 V.
CADRsmoke 99-108 CFM, dust 118 CFM, pollen 125 CFM.
Noisemanufacturer claims 40 dBA low and 55 dBA high; an instrumented test measured 46.7, 50.5 and 54.2 dBA.
Filtrationpre-filter/charcoal plus True HEPA, marketed as 3-stage or 4-in-1, with an optional 5 W UV-C bulb.
FiltersFLT4825 Filter B, about 6-month life; LB4000 UV-C bulb every 10-12 months.
Coverageabout 150-170 sq. ft.
Dimensions22.00 × 10.25 × 6.75 in; 8.55 lb.
CertificationsEPA, CARB, Energy Star and AHAM per Air Purifier First; ETL Listed and explicitly not UL Listed per the manufacturer.
Controlsrotary three-speed knob and a UV-C button with filter-change and bulb-change indicators; no sensor, app, timer, auto mode or night mode.
Warranty3-year limited.
Full research notes and sources

Room size and real coverage

The number to distrust is 743 square feet. Guardian’s own bundle copy explains it as a 153 sq. ft. room cleared in 12.5 minutes, or 743 sq. ft. of air moved every hour, which at roughly 99 CFM smoke matches a throughput claim rather than a room size. Consumer Reports caps coverage at 153 sq. ft., Air Purifier First sizes it at 167 sq. ft. at 4.8 ACH, and a 2015 specialist review argued for about 125 sq. ft. Buy it for a bedroom, dorm or small office.

Measured performance and noise

Air Purifier First bought its own unit and measured a 92% particle reduction in 60 minutes at maximum speed in a 194 sq. ft. room, 90% in a 320 sq. ft. room, and 38 seconds to clear a smoke-filled glass box. It drew 30.8, 34.8 and 39 W on the three speeds with 0 W in standby, and turning the UV-C lamp on added only 1%. Consumer Reports is much colder on the core job: “Mediocre at removing dust, smoke, and pollen from a room’s air when run at its highest speed, and less effective at low speed.” Both agree the low speed is loud for the class; treat 46-47 dBA as the real figure.

Filters and running costs

Genuine FLT4825 Filter B costs $24.99 direct from Guardian Technologies, $22.49 on subscription and $25.99 at Lowe’s (2026), and at roughly six-month intervals that is about $50 a year. Consumer Reports puts annual filter cost at $58 and electricity at $70; Air Purifier First’s measurements imply about $41 a year at continuous high speed. Third-party filters undercut the genuine part, but Lowe’s warns off-brand filters often fall short.

Is it worth it?

At $80, roughly where Home Depot listed the AC4825E, it is an easy buy for a small room: a 3-year warranty, a cheap documented filter path and measured particle removal that is fine at its size. At Guardian Technologies’ own $99.99 it is still reasonable. Above $120 the argument weakens, because comparable money buys higher-CADR units with sensors.

Which model this is

The AC4825E is the black version of the AC4825 Series, with white (AC4825W) and gray (AC4825DLX) siblings on the same chassis. The manual covers the series with a 3-year limited warranty. This page’s listing is ASIN B004VGIGVY. Filter FLT4825 is cross-listed for several other GermGuardian models, so third-party filter listings that name many models are expected.

Sources

Manufacturer:

Independent reviews:

Owner reports:

Parts:

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