Product: Germ Guardian AC4100
Type: Desktop True HEPA Filtration
Filtration Stage: 3 Stage Filtration System
Product Warranty: 1 year
Room Coverage: 78 square feet small room and apartment

CADR Rating (Smoke, Dust, Pollen): 50 | 56 | 76
ACH Rating:
Power Consumption:
40 Watts
Noise Level: 
very quiet at lowest setting, noisy at highest setting
Annual Filter Costs:
$24 per year

Germ Guardian 3-in-1 AC4100 Air Purifier
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The Germ Guardian 3-in-1 AC4100 Air Purifier is the best desktop device on the market. If you are looking for a device under $60 that still has a True HEPA filter then this is the RECOMMENDED air purifier for you.



Guardian Technologies™ produces the leading edge home environment products include air purifiers, uv air sanitizers, ultrasonic humidifiers, essential oil diffusers, essential aromatherapy oils, HEPA Filters, and heating and cooling appliances.


Germ Guardian 3-in-1 Desktop AC4100 Air Purifier

The Germ Guardian AC4100 is recommended as the best desktop air purifier for your home or office.

It uses a 3 stage filtration system with a True HEPA filter.

Germ Guardian Features

Germ Guardian AC4100 3 Stage Filtration System

3 Stage Filtration System

  1. Pre-filter & Charcoal filter captures large dust particles, pet hair, absorbs odors & volatile organic compounds (VOCs).
  2. UV-C Light kills airborne germs & viruses.
  3. True HEPA filter captures 99.97% of dust mites, pollen & pet dander.

Germ Guardian AC4100 Room Coverage

The Germ Guardian AC4100 is designed for a small room (78 square feet). The ACH of this device is 4X.

The CADR of GermGuardian AC4100 is 50 Smoke | 66 Dust | 76 pollen (cfm). For a compact air purifier, the GermGuardian AC4100 has better fan power than the Levoit LV-H132 which is double it price but with only 40 cfm in CADR rating.

Germ Guardian AC4100 Design and Size

The GermGuardian AC4100 is a simple-looking compact air purifier.

This air purifier is one of the most compact air purifiers in the world at 11 inches in height and only 4.85 lbs in weight.

This air purifier has a full-size air output grill from the front and another grill for air intake from the back. This design concept easily maximizes the fan power of GermGuardian AC4100.

Instead of a control panel, you have only one switch and one button at the front of GermGuardian AC4100. This air purifier is the most suitable for putting on desk or side table. You can easily move this device around due to its size and design.

Noise Level

On the lowest setting the Germ Guardian AC4100 is one of the quietest air purifiers. However on the highest setting there is a high pitch noise.

Germ Guardian AC4100 Price

For around $50 you will get the GermGuardian AC4100 with higher quality than common HEPA air purifiers in the price range.  The only other compact air purifier comparable to this is the Hamilton Beach TrueAir Compact.

If you are looking for a starter air purifier then this one is perfect for you.


+ Best cheap air purifier under $60

+ Good filtration process

+ True HEPA filter


 noisy at highest setting

– lack of smart features

1 year warranty


The Germ Guardian AC4100 is one of the best desktop air purifiers in town. We recommend this device based on the reasoning below:

  • Filtration Quality: There’s only a few desktop air purifiers with a True HEPA filter. This device filters out 99.97% of particles and also allows you to customize your filtration to remove specific contaminants.
  • Design: With its sleek and customizable design allows the device to easily be hidden as an art piece rather than an eyesore in your room.
  • Portability & Price: Under 5 lbs and $60, this desktop device is perfect for a small room.

Where Can I Buy It?

Check the latest price on my number one online trustworthy store, Amazon.


Germ Guardian 3-in-1 AC4100 Air Purifier

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