HEPA Air Purifier – High Efficiency Particulate Air

You may be curious as to what the HEPA air purifier hype is all about, especially as it has become a very popular device to purify the air and is being purchased in many homes. HEPA is an air filter which is used when certain very specific parameters are required. It is a special design of air filter with applications in many industries, but especially critical in medicine.

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The Meaning of HEPA Air Purifier
High-Efficiency Particulate Air (HEPA) purifier is a type of filter air purification system which is placed in locations where very pure air is absolutely essential. Facilities which use HEPA systems include medical structures, automotive vehicles, homes, airplanes, or wherever the particularly stringent need for extremely clean air exists.

A HEPA air purifier must be able to remove 99.97% of all particles which are greater than 0.3 micrometers to qualify as HEPA by the United States Department of Energy standards. While a filter which is qualified to be called a HEPA is superior to those which are not, there are further internal classifications which need to be respected when it comes to replacing these filters. The proper grade of filter must be maintained when the HEPA filter is being replaced.

How Do HEPA Air Purifiers Work?
A HEPA air purifier is a filter which is constructed of a mat of fibers which are randomly arranged. The fibers are usually made of forms of fiberglass, and have diameters of between 0,5 and 2.0 microns. The quality, or function, or a HEPA air purifier is largely dependent on the fiber diameter, total filter thickness, and face velocity, and the air space that exists between the HEPA filter fibers is above 0.3 microns.

There is a common misconception that the HEPA air purifier filter acts like a sieve or a mechanism in which particles smaller than the largest opening will be able to pass through. HEPA air purifiers instead are designed and can indeed trap much smaller particles and pollutants; they stick to the HEPA filter fibers through a variety of different mechanisms.

Impaction: Larger pollutant particles are unable to avoid the fibers as they follow the curving contours of the air stream and end up impacting on the fibers and embedding in them directly.

Diffusion: The smallest particles collide with gas molecules, especially when smaller than 0,1 micron in diameter, and their resultant path is impeded and delayed within the filter. Due to the delay in traveling and random motion they are subjected to, there is a greater chance of the particles being stopped by either Impaction or Interception.

Interception: When a particle follows a specific line of flow in the present air stream and comes within one radius of a fiber, and then adheres to that fiber.

Where are HEPA air purifiers used?
Health Care and biomedical facilities almost universally utilize HEPA air purifiers in order to prevent the spread of airborne microbes such as viruses and bacteria, thus preventing infection as a result. These systems also usually include adjunct systems such as ultraviolet light which kills the live microorganisms which are trapped in the filtration system.

Vacuum cleaners are now very frequently using the HEPA system for their filtration, as this has enormous benefits for those with asthma and other respiratory ailments. This is because the HEPA system can trap allergens, dust, and pollens. In order for the machine to be effective, though, all of the air which is drawn into the machine must be expelled through the filter, with no air leaking directly past the filter.

All modern airplanes of the airliner variety use HEPA filters in order to minimize the chances of spreading airborne pathogens in the recirculated air that’s being used in the cabin. The quality of HEPA system used in airplanes is similar to that of hospitals. For comparison, those used in airplanes or hospitals are superior to the ones used in homes. Some newer cars now feature a HEPA filter too. This purifies the air in the passenger compartment.

What is HEPA air purifier? It is a filtration system which removes a vast quantity of pollutants and pathogens from the air, leaving clean air for breathing. It is used in many places, but has very important application in hospitals, military facilities, airplanes and vacuum cleaners.

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