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Green Clean™    |   Terminology

HEPA Filters: Function

HEPA filters, according to the standard adopted by most industries, remove at least 99.97% of airborne particles 0.3 micrometers in diameter.

HEPA filters are composed of a mat of randomly arranged fibres. The fibres are typically composed of fiberglass and possess diameters between 0.5 and 2.0 micron. Key factors affecting function are fibre diameter, filter thickness, and face velocity. The air space between HEPA filter fibres is much greater than 0.3 µm. The common assumption that a HEPA filter acts like a sieve where particles smaller than the largest opening can pass through is incorrect. Unlike membrane filters, where particles as wide as the largest opening or distance between fibres cannot pass in between them at all, HEPA filters are designed to target much smaller pollutants and particles. These particles are trapped (they stick to a fibre) through a combination of the following three mechanisms:

  1. Interception, where particles following a line of flow in the air stream come within one radius of a fibre and adhere to it.
  2. Impaction, where larger particles are unable to avoid fibres by following the curving contours of the air stream and are forced to embed in one of them directly; this effect increases with diminishing fibre separation and higher air flow velocity.
  3. Diffusion, an enhancing mechanism is a result of the collision with gas molecules by the smallest particles, especially those below 0.1 µm in diameter, which are thereby impeded and delayed in their path through the filter; this behavior is similar to Brownian motion and raises the probability that a particle will be stopped by either of the two mechanisms above; it becomes dominant at lower air flow velocities.

Diffusion predominates below the 0.1 µm diameter particle size. Impaction and interception predominate above 0.4 µm. In between, near the 0.3 µm MPPS, diffusion and interception predominate.

HEPA filters are critical in the prevention of the spread of airborne bacterial and viral organisms and, therefore, infection. Typically, medical-use HEPA filtration systems also incorporate high-energy ultra-violet light units to kill off the live bacteria and viruses trapped by the filter media. Some of the best-rated HEPA units have an efficiency rating of 99.995%, which assures a very high level of protection against airborne disease transmission.

Many vacuum cleaners also use HEPA filters as part of their filtration systems. This is beneficial for asthma and allergy sufferers, because the HEPA filter traps the fine particles (such as pollen and dust mite feces) which trigger allergy and asthma symptoms. For a HEPA filter in a vacuum cleaner to be effective, the vacuum cleaner must be designed so that all the air drawn into the machine is expelled through the filter, with none of the air leaking past it. This is often referred to as "Sealed HEPA" or sometimes the more vague "True HEPA." Vacuum cleaners simply labeled HEPA have a HEPA filter, but not all air necessarily passes through it. Finally, vacuum cleaner filters marketed as "HEPA-like" will typically use a filter of a similar construction to HEPA, but without the filtering efficiency. Because of the extra density of a HEPA filter, HEPA vacuum cleaners require more powerful motors to provide adequate cleaning power.


Hydroxyl Generator: How it Works

The Product:

The Odorox Hydroxyl Generator optics creates synthetic ultraviolet rays. Contaminated air is directed into the UV sanitizing chamber where ambient humidity and UV rays combine to create hydroxyls. The first segment of the UV optics produces rays which deodorize the air flow. The second segment of the optics produces UV rays which prevent bacteria and other micro-organisms from multiplying. Then the processed air is recycled back into the indoor environment. The Hydroxyl Generator is ideal for odor abatement, Volatile Organic Compound (VOC) breakdown, indoor air purification, air decontamination, and eradication of mold and mildew.

The system utilizes patented technologies that for the first time harness multiple UV light wavelength ranges. These wavelengths combined with ambient air humidity create Hydroxyls, which naturally occur when ultraviolet rays from the sun come in contact with humidity. This is how Nature cleans our atmosphere. HGI's main technology is a device that generates "superior hydroxyls" that safely eliminates bacteria, mildew, mold, noxious gases and odors from Volatile Organic Compounds (VOC's) for use in indoor environments.

All our Hydroxyl Generators are ETL (Electrical Testing Laboratories) certified for safety and quality assurance by the world's largest independent testing, inspection and certification partner, Intertek. ETL is a US independent safety agency that sets standards for product safely.

Similarly we have third party tested our equipment for gas, chemical and VOC emissions in California using the accredited Columbian Analytical Services. The Sunshine state is renowned as having some of the toughest environmental laws across the globe.

Now, you can safely experience this natural, gentle and most effective cleaning agent in your own environment. This is a big departure from the drawbacks of prevailing air purification methods, such as Ozone generation and Ionizers.

Sick Building Syndrome, Multiple Chemical Sensitivities, Chronic Fatigue Syndrome, Challenged immune systems and Asthma are only a few of the challenges that we face in our indoor environment. Therefore, our goal is to create a safe environment for all who desire a healthy lifestyle.

The Process:

The Odorox Hydroxyl Generator optics creates synthetic ultraviolet rays. Contaminated air is directed into the UV sanitizing chamber where ambient humidity and UV rays combine to create hydroxyls. The first segment of the UV optics produces rays which deodorize the air flow. The second segment of the optics produces UV rays which prevent bacteria and other micro-organisms from multiplying. Then the processed air is recycled back into the indoor environment. The Hydroxyl Generator is ideal for odor abatement, Volatile Organic Compound (VOC) breakdown, indoor air purification, air decontamination, and eradication of mould and mildew.


For more information, please visit these sites:
About Hydroxyls
What is Hydroxyls



Our first priority in remediation is the safety of both our workers and the occupants, combined with the efficiency of which we complete our task. In some instances an exceptional level of cleaning needs to be considered to ensure increased protection of our environment and the toxicity level to those prone to sensitive health issues. Our Green Clean methods make this service available to everyone.

Click here to read frequently asked questions.



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