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HEPA Air conditioner filter

HEPA Filters

HEPA filters (High Efficiency Particulate Air) are able to eliminate at least 99.96% of particles in the air which are as small as 0.3 micrometers in diameter. Particles that are this small can be the most complicated, if not impossible, to filter and are therefore deemed to be the most penetrating particle size (MPPS). Particles which are smaller in size or larger in size can be filtered with greater effectiveness with a HEPA filter.

HEPA filters are made of fibers which are arranged in random fashion 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. It is a common error to think that the HEPA filter performs like a strainer where the larger openings in the filter would allow smaller particles 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 contaminants 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.

Looking back at its history, the HEPA filter was first created in the 1940s and put to use to inhibit the spread of radioactive airborne particles. The HEPA filter was commercialized in the 1950s and this original term, HEPA, became the commonly used term for any highly effective filter of similar design. Over the past five decades, filters have progressed to meet higher expectations for the quality of air in various technological industries. Today, HEPA filters are used in variety common places, such as hospitals, vacuum cleaners, and even in the nuclear industry.

For personal household use, a vacuum cleaner which employs the use of 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 miniscule particles before they can trigger the onset of symptoms. In order for the vacuum with a HEPA filter to work at its optimum, 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 generally 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.

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