GermGuardian AC4825 3-in-1

GermGuardian AC4825 3-in-1 Review

The latest 22 inch GermGuardian AC4825 3-in-1 is considered one of the entry-level tower air purifier from its AC series. Featuring a 4-stage filtration with robust level of purifying depth, GermGuardian AC4825 is an admirable tower air purifier that would not cost you a bomb. With few convenience features to be compromised for its low price tag, does GermGuardian AC4825 3-in-1 offer enough filtration performance in the likes of AC5000 or AC5250PT? Continue read to find out more.
± 149.99 p
     Annual filter ^    
± 72 - 100 p
Online price*
Latest Amazon price

GermGuardian AC4825 Specification

ProductGermGuardian AC4825
5.5 x 21.5 x 9 in
(14 x 54.6 x 22.9 cm)
Weight7 lb (3.2 kg)
Coverage (up to)155 sq. ft. (14 m2)
Dust free (CADR)
Pollen free (CADR)
Smoke free (CADR)100 cfm (170 m3/h)
Airflow speed
- Lifespan
- Replacement cost ($)
Charcoal pre-filter
6 - 9 months
HEPA filter
- Lifespan
- Replacement cost ($)
True HEPA filter
6 - 9 months
Carbon filter
- Lifespan
- Replacement cost ($)
Ionizer/ Technologies
UV-light/ PCO
LB4000 UV-C Light
10 - 12 months+- 24.99
Other filter
All-in-one filter
- Lifespan
- Replacement cost ($)
FLT4825 Filter-B True HEPA
6 - 9 months
+- 34.99
Optional/ Addon
FLT22CB4 Carbon Filter (4 pack)
+- 14.99
FLT4850PT Filter-B-Pet True HEPA
6 - 9 months+- 39.99
Noise level
Power consumption
Timer/ Scheduler
More color options
Auto mode
Air qualityAQ indicator
Filter change indicator
Wi-Fi/ BTBluetooth
Remote control
Child lock
Warranty3 years
Email/ Phone support

Product image

Key features

  • 4-stage filtration with 3 speed
  • True HEPA filter with 99.97% filtration rate and capture particles as small as 0.3 microns
  • Charcoal pre-filter
  • Optional UV-C light technology with Titanium Dioxide
  • Quiet operation
  • 3 years warranty

GermGuardian AC4825 review

  • Inexpensive especially after the online discounted price.
  • Decent but not over the top CADR return for an air purifier of its price range.
  • Use True HEPA filter instead of HEPA-type filter like most tower air purifier.
  • UV-C light is effective in eliminating airborne mold, bacteria, germs and viruses.
  • 3 years warranty.
  • The total annual filter replacement cost is close to the price of a brand new AC4825.
  • The combined charcoal pre-filter smoke filtration is less effective than a pure granular activated carbon filter.
  • Uses a smaller UV-C light compare with AC5000 series.
  • Slightly troublesome to replacing UV-C light as you are require to unscrew 2 screws to pull out the bulb.
  • No timer, Auto mode and air quality display.

The starters

GermGuardian AC4825 dimension
5.5 x 21.5 x 9 in
(14 x 54.6 x 22.9 cm)
GermGuardian AC4825 weight
7 lb (3.2 kg)

Almost a mirror to GermGuardian AC4850PT, 5.5 x 21.5 x 9 in dimension and 7 lb weight is far from your typical compact size tower air purifier. In fact, it’s height is even taller than some console air purifier with similar specification. While it’s lack premiumly touches and fitting quality, there is a nice blue strip light at front that help enhance the overall black housing exterior. Controls is placed at top for easy fan speed adjustment. Filter reset is slightly tricky as the fiddling protected button requires a pin to click on it like most smartphone sim card slot. Specification wise GermGuardian AC4825 is nothing out of ordinary but for this price point there is still an impressive 4-stage filtration including a True HEPA filter, dedicated UV-C light filtration and a manufacturer 3 years warranty.

Airflow, CADR and everything in between

GermGuardian AC4825 coverage
Purifying coverage
155 sq. ft. (14 m2)
GermGuardian AC4825 fanspeed
GermGuardian AC4825 can cover an respectable 155 sq. ft. size purifying coverage at 5 air charges per hour. Airflow delivery rate is consistent and punchy via its 3 selectable speed thus GermGuardian AC4825 will work well in guest lounge or living hall although not as quick and effective as in bedroom.
GermGuardian AC4825 smoke CADR
Smoke CADR
100 cfm (170 m3/h)
With no official CADR released at the point of this writing, GermGuardian AC4825 smoke CADR stands at 100 cfm. Mid par level and we can safely conclude dust and pollen CADR should be around the same region. Again compare with GermGuardian AC4850PT or AC5250PT, the overall clean air delivery rate is identical.

What’s inside count

GermGuardian AC4825 Pre-filter
Charcoal pre-filter
6 - 9 months
GermGuardian AC4825 HEPA filter
True HEPA filter
6 - 9 months
GermGuardian AC4825 UV-light
LB4000 UV-C Light
10 - 12 months
^ GermGuardian AC4825 filters/ technologies/ lifespan
Arguably the biggest selling point of GermGuardian AC4825. For a tower air purifier that has limited filter space, the air purifier is equipped with a 4-stage filtration that covers all sort of airborne particles. Firstly, there is a charcoal pre-filter that can trap dust along with light smoke and odor. Continue on that path is a True HEPA filter that traps smaller, micron size particles escaped from the pre-filter. Unlike GermGuardian AC4850PT or AC5250PT, there is no Pet Pure antimicrobial agent coating that inhibit the growth of bacteria and viruses. What is included though is the bulb powered UV-C light that is effective in eliminating airborne allergens and germs trap inside the air purifier.

Covered against

GermGuardian AC4825 VS Dust



GermGuardian AC4825 VS Pollen



GermGuardian AC4825 VS Hair

Hair/ Pet hair


GermGuardian AC4825 VS Dust mite

Dust mites


GermGuardian AC4825 VS Mold/ Mildew

Mold/ Mildew


GermGuardian AC4825 VS Pet dander

Pet dander


GermGuardian AC4825 VS Virus/ Germ

Virus/ Germ


GermGuardian AC4825 VS Tobacco smoke

Tobacco smoke


GermGuardian AC4825 VS Chemical



GermGuardian AC4825 VS VOCs



GermGuardian AC4825 VS Smoke/ Gas

Smoke/ Gas


GermGuardian AC4825 VS Odor



GermGuardian AC4825 4-stage filtration and purifying applicable area is excellent when take on irritants, allergens, viruses and bacteria. It is very efficient on typical airborne particles example dust, pet hair. On the one hand against micron-size particles, GermGuardian AC4825 3 speed airflow distribution + is good at capturing pet dander, dust mites, fungi, pollen, mildew, mold, spores and germs.  On smokes, odors and fumes, GermGuardian AC4825 filtration is below par in handling chemicals, odors, cooking smell, fire, VOCs, tobacco smokes, cigarette, vapor, radon and ammonia.

Keep it down

GermGuardian AC4825 generated noise through our naked ears is at normal grade which means is low with little audible sound at 1 speed, louder buy bearable sound at 2 speed and very loud at third speed. For night time use we reckon the first 2 speed is still acceptable. On to power consumption, GermGuardian AC4825 mid range airflow delivery rate demands little power at low speed and gradually moves up when higher speed is selected. No auto or sleep mode function so the current speed you selected will be the final speed throughout the day.

At what cost

GermGuardian AC4825 MRSP/ RSP
+- 149.99
GermGuardian AC4825 annual filter replacement cost
Annual Filter Cost
+- 72 - 100
^ Replacement filters/ estimated cost
Still a very popular air purifier despite the replacement models is already out, GermGuardian AC4825 is at borderline cheap for a full-size tower air purifier that comes with 4-stage filtration. Annual filter replacement cost is inexpensive unless indoor air quality is really bad that really pushes the filter lifespan. You probably can save up even more if you do not utilize the UV-C light. Personally, we would go for the higher spec model GermGuardian AC5250PT that offers more for around the same price bracket, you can never go wrong with GermGuardian AC4825 either. See how GermGuardian AC4825 fare compare with its closest competing models.

The challengers

GermGuardian AC4850PT

An identical model that comes with additional 2 fan speed, Pet Pure treatment (antimicrobial), programmable timer and 5 years warranty.

GermGuardian AC5250PT

The slightly bigger, slightly more powerful and slightly more expensive air purifier that also comes with 5 speed, Pet Pure treatment (antimicrobial) and timer.

Verdicts and ratings

Build quality
Airflow delivery
Particle Filtration
Smoke Filtration
GermGuardian AC4825 3-in-1

Frequently Asked Questions FAQ


Safety Tips

More on GermGuardian AC4825 3-in-1

Resembles to other GermGuardian Tower Air Purifier, GermGuardian AC4825 3-in-1 22 inch size is not compact but not overly bulky either. Made with black plastic housing with front air vent, the overall appearance is modern and practical for everyday use. Build quality is good with no no askew parts or filter gaps. Controls is located at top with one dial knob to control on/ off and the 3 fanspeed. With no digital display, timer or any other addon function, GermGuardian AC4825 3-in-1 only comes with passive features like ENERGY STAR rate, Safety certified by Intertek (Nationally Recognized Testing Laboratory) and 3 years warranty.

Airflow effectiveness and purifying coverage

Despite the inclusion of charcoal pre-filter, True HEPA filter and UV-C light, GermGuardian AC4825 3-in-1 is still essentially a tower air purifier so the airflow coverage will fall at a restrained level. Appropriate for small room size like bedroom even though living hall could do with it as well. Moving forward with the purifying capability, GermGuardian AC4825 3-in-1 100+ smoke CADR means it can pull in a good amount of air-borne particles within its radius. The steady airflow delivery rate would take up and halt nearby dust, bacteria or odor from flowing around the home.

Noise level and power consumption

GermGuardian AC4825 3-in-1 noise level is significantly lower due to the silent technology and well enclosed body framework. Virtually no noise at low fan speed, light noise at medium fanspeed and distinct noise at high fanspeed. Compare with other quite similar tower air purifier, you would have no problem with GermGuardian AC4825 3-in-1 produced noise level. Carrying on with the power usage, not only GermGuardian AC4825 3-in-1 is ENERGY STAR rated, the moderate airflow distribution means it will not hurt your wallet on utility bills even in long-run. Electricity consumption is fairly low across all fanspeed although you do have to manually adjust the speed as Auto mode is not included in the feature. By comparison with other home appliances power consumption, GermGuardian AC4825 3-in-1 monthly electricity usage level is reasonably low.
noise graph

Final thoughts on GermGuardian AC4825 3-in-1

In short, we love GermGuardian AC4825 3-in-1 low price tag, consistent airflow output and 4-stage filtration. In comparison with the upsides and downsides, the higher grade and more expensive GermGuardian AC4825 would probably be a safer buy if you are not entire sure what type of air purifier you are looking for.

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