Germ Guardian AC4825 3-in-1 Air Cleaning System - Tower Air Purifier

Germ Guardian AC4825 3-in-1 Air Cleaning System is affordable true HEPA air purifier suitable for medium size rooms. It features multilayered air cleaning system, based on activated carbon air filter and mechanical pre-filter, true HEPA air filter and UV-C lamp in combination with titanium-dioxide layer. Germ Guardian AC4825 is quiet, reliable and very simple unit to operate with minimum operating costs.

Updated: February 10, 2020.

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Germ Guardian AC4825 weighs ~7 pounds (~3.2 kg) and is 21.5 inches high, 9 inches deep, and 5.5 inches wide (~55 x 23 x 14 cm) and in most situations, it is positioned on the floor.

As an object, Germ Guardian AC4825 is tower shaped unit, but it is stable - however, keep kids and pets away from it, as it can fall over when pushed with enough force.

Power cord is 6 feet (~1.83 m) long.

Germ Guardian AC4825 Air Filtration System

As mentioned before, Germ Guardian AC4825 is 3-in-1 unit, featuring 3 main layers of air purification:

- mechanical air pre-filter, combined with active carbon layer: mechanical air pre-filter filters out larger air pollutants and protects the rest of the unit from lint, fibers, pet and human hair and similar larger debris.

Active carbon layer removes common household odors and certain chemicals.

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Note: there are two types of these filters: FLT4825 Filter-B True HEPA GENUINE Replacement Filter and FLT4850PT Filter-B-Pet True HEPA GENUINE Pet Pure Replacement Filter. Main difference between these two filters is that FLT4850PT Filter-B-Pet True HEPA GENUINE Pet Pure™ Replacement Filter also features so-called the 'Pet Pure' treatment, which is an antimicrobial agent added to the filter to prevent or at least, slow down the growth of mildew, mold and odor-causing germs on the filter surface.

Since filters should be replaced every 6-9 months, IMHO, price difference justifies getting FLT4850PT air filter.

- true HEPA air filter filters out 99.97% of 0.3 microns or larger particles, greatly improving the air quality. Mechanical air pre-filter, active carbon filter and true HEPA air filter are actually one single item, enabling the user to replace the dirty filter rather quickly, simplifying the maintenance.

- UV-C lamp irradiates the purified air, killing what is left in the air stream. Also, UV-C activates titanium-dioxide which removes remaining odors and some chemicals from the air, resulting in essentially clean air being expelled at the front of the unit.

Germ Guardian AC4825 Controls

germguardian ac4825 3Germ Guardian AC4825 doesn't feature WiFi connectivity and can't be controlled with Amazon Alexa and Google Assistant. Some people consider this a drawback, while some people appreciate its simplicity.

Controls are very simple:

- by turning power knob clockwise, unit is turned on and desired power mode is set - Low, Medium and High.

- to turn the UV lamp on and off, press UV button.

Note: in test environment (30 cubic meters for 8 hours), Germ Guardian AC4825 with UV lamp turned on produces around 0.001 ppmv (parts per million by volume) of ozone. Maximum allowable concentration of ozone for 24 hour period is 0.05 ppmv and recommended maximum exposure limit for 8 hour period is 0.02 ppmv.

Obviously, although Germ Guardian AC4825 does produce ozone, its levels are well below the safety level. Nonetheless, some people prefer to use unit with UV-C lamp off and that is what UV on/off button is used for.

Germ Guardian AC4825 also features indicators to warn the user that it is time to replace the air filter and UV-C lamp.

Note: Although Germ Guardian AC4825 is very simple to operate unit, it is highly recommended to thoroughly read the manual before the very first use.

When operating the unit, always make sure that nothing blocks the grills and that there are at least one foot of free space around the unit.

Germ Guardian AC4825 CADR Rating

Germ Guardian AC4825 CADR rating is 100+, but the manufacturer doesn't state for what kind of air pollutants (CADR ratings are commonly given for smoke, dust and pollen.

Nonetheless, unit is recommended for medium rooms of up to 155 square feet (~14 square meters).


Long Story Short: Germ Guardian AC4825 is simple and affordable air purifier that does its job well. It is very simple to use unit with very low maintenance costs.

While some users complain that there is no WiFi or Bluetooth connectivity, some users consider it as a bliss :)

All in all, if you need a good air purifier for medium size room, consider Germ Guardian AC4825 air purifier.

For more reviews and recommendations, feel free to check Germ Guardian AC4825 True HEPA Air Purifier Amazon link (link opens in the new window).