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HEPA Ait Filter

HEPA Filters

HEPA filters are sometimes referred to as HYPER filters for their ability to eliminate such high percentages of airborne particles. These particles can be as small as 0.3 micrometers in diameter! HEPA filters get rid of, at the very least, 99.96 percent of even these smallest particles. These particles are usually the most complicated to filter, if not impossible.

The HEPA filter was originally created in the 1940’s and put to use to stop the spread of radioactive airborne particles. The HEPA filter was first made public in the 1950s and its name, HEPA, became the broad name for any similarly-designed filter. Over the past 50 years, there has been much advancement made in the filter production and design. Today, HEPA filters are commonly used in places such as hospitals and even in vacuum cleaners.

For domestic use, a vacuum cleaner which uses a HEPA filter can be especially beneficial for people who suffer from chronic asthma or allergies. Pollen and the feces of dust mites can cause many problems for allergy sufferers, but the HEPA filter will work to trap these tiny particles before they have the opportunity trigger the onset of symptoms. In order for the HEPA-filtered vacuum to function at its peak, the machine must be equipped with a filter through which all the air that is drawn into the vacuum is ejected through a filter, ensure that none of the air is leaking past. Vacuum cleaners that are fitted with a HEPA filter usually require a more powerful motor in order to supply the adequate cleaning power. If you suffer from seasonal allergies which seem to be triggered when you clean your house or building, a HEPA filter-vacuum might be the ideal solution for your home or business.

HEPA filters are made of randomly-arranged fibers into a type of mat. Certain elements that can affect functionality of the HEPA filters are the thickness of the filter and the diameter and density of the fibers. Many people thing that a HEPA filter performs like a strainer where the larger openings in the filter would allow smaller objects to flow through. In actuality, if particles are so big that they are in fact as wide as the biggest opening in the filter, they cannot pass through the fibers at all.

The HEPA filters are made in such a way to capture much smaller contaminants, by causing them to stick to the fibers of the filter, in one of these ways:

Interception: Smaller particles follow along the train of airflow and come within radius of the fiber and thus get stuck to the fiber.

Impaction: Larger contaminants are not able to avoid the fibers of the filter and thus stick to the fibers by force of air flow.

Diffusion: The smallest particles collide with gas molecules and are therefore slowed down in their air flow path through the filter.

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