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Competitive Product Comparison

There are 3 types of indoor air pollutants - Particulates, Microbials and Gases. Therefore, in order to make an apples-to-apples comparison, we must compare what each type of indoor air quality product is attempting to do. There is an industry rule of thumb:

"If it is alive you have to kill it."

"If it is dead you have to trap it."


Particulates are tiny particles suspended in the air. Common particulates include residential pollen, dust mites, dust, smoke and dander (skin flakes). Particulate diameters are measured in microns and range from .001 to 1,000 microns. These dimensions represent the continuum from a few molecules up to the size where particles can no longer be airborne.


These are bacteria, germs, viruses, fungi, spores and mold. Although bacteria are small in size and usually microscopic, they have an amazing ability to do horrible damage to all living organisms including humans. Many everyday illnesses are also caused by viruses like the common cold or the flu.


Indoor odors and gases, such as benzene, formaldehyde, chloroform, hydrogen sulfide, ammonia, etc., are released from furniture, cabinets, carpets, cleaning chemicals, copy machines, insulation, insect sprays, hair sprays, etc.

Filter Tech Capabilities

HEPA Filters

HEPA stands for high efficiency particulate air filter. HEPA filters utilize a powerful blower to force the air through a very tight membrane to achieve high efficiency particulate filtration.

Pros: They are very efficient in the filtering of air that passes through the filter. They filter to .03 micron.
Cons: They require filter changes. The filter can act as a breeding ground for bacteria, mold and fungus. They do not remove odors, gases, pesticides, viruses, and many bacteria. They reduce airflow due to the tight pores of the filter. They are generally not used in central systems, and sold as stand-alone units only.

Fiber/Foam Filters

Fiber or open-cell foam filters rely on the air passing through a matrix of foam cells or fibers of fiberglass, wire, plastic or cloth. Typically, these filters only stop medium to large particulate.

Pros: Low cost, low air resistance, installed in central units
Cons:They only filter the air that passes through the filter. The particle build-up can act as a breeding ground for bacteria. They only filter medium to large particulate.

Carbon Filters

Carbon filters consist of carbon impregnated filter fabric or granulated carbon. These filters usually have a foam or fabric filter to hold the media. Carbon has the unique capability of acting as a physical filter trapping particulate, and on a chemical basis by reacting with some odors and some of the heavy gases.

Pros: Absorbs odor, absorbs some gases, filters particulate, installed in central or individual rooms.
Cons: Requires frequent changes, acts as a breeding ground for microorganisms, can easily become blinded and ceases functioning. They reduce airflow.


Electrostatic Precipitators have been used by industry for many years to clean up smokestack emission of particulate. They operated by electrically charging a field between metal plates. The air is charged with an electrical charge similar to static electricity. The charged particulates collect and coagulate on a second set of charged plates where they build up and fall to a collection tray.

Pros: They are very effective on removing smoke from the air that passes through the filter. They do not reduce airflow as most other filters do. They can be installed in central units or in each room.
Cons: They require frequent cleaning. They only filter the air that passes through the filter. The particle build-up can act as a breeding ground for bacteria.

Negative Ion Generator

Negative ion generators have been used by industry for years to remove particulates from the air and to neutralize the effects of excess positive ions. Negative ions are produced electrically and travel through the air until they attract airborne particulate and coagulate the particulates until they are too heavy to drift and settle to the floor.

Pros: They are very effective on removing smoke from the air. They travel throughout the entire room and purge all the air of particulate, not just the air that passes through a filter.
Cons: They drop the particulates to the ground. They must be in each room as the ions cannot effectively travel through HVAC ducts.


Ozone is a gas of oxygen - an oxygen molecule containing three atoms instead of two, like the oxygen we breathe. The extra atom of ozone is known as a loose radical that looks for organics to attach to and thereby oxidize. Ozone is known as a friendly oxidizer due to the fact that it reverts back to oxygen after oxidation occurs.

Pros: Ozone is an oxidizing gas that travels throughout the room and oxidizes all organics. Ozone can neutralize odors and gases. Ozone destroys microorganisms and does not reduce airflow. Ozone units can be installed in central units or in each room.
Cons: Ozone has no effect on particulate solid particles. Ozone exposure can be very dangerous at high levels.

UV Lights

Ultraviolet light rays have been used as a sanitizer by the medical profession for years. Ultraviolet light can also sanitize air that is passed directly in its path with the proper exposure times.

Pros: Ultraviolet light can destroy bacteria, fungus, molds and some gases. It does not reduce airflow.
Cons: Ultraviolet light has no effect on particulate, needs direct close contact with a calculated exposure time, Ultraviolet light rays must be shielded from human exposure. UV Light has little to no effect on the conditioned space

Photohydroionization (Guardian Air)

An advanced oxidation technology patented by RGF utilizing broad spectrum.

HE/UV light targeted on a quad metallic target that creates very low ozone levels (.01 - .02 ppm), super oxide ions, hydro peroxides, ozonide ions and hydroxide ions.

Pros: A broad scope of oxidizers makes it extremely effective on a larger number of microbes and gases.
Cons: Little effect on airborne particulate.


A unique combination developed and patented by RGF that uses a Charged Advanced Oxidation Plasma to provide continuous purification with the ability to increase the efficiency of removal of .03 micron particulates with standard media filters up to 73%. Filtration can be increased to 93% with RGF REME+ Grounded Collector.

Pros: All the benefits of Photohydroionization with the added benefit of increased efficiency and particulate removal.
Cons: Must maintain Grounded collector or filter.