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Knowing More on HEPA Filter-Vacuum Cleaners During World War II, when highly classified companies where dealing with radioactive materials, they introduced High Efficiency Particulate Air (HEPA) filters were invented to prevent these harmful radioactive particles from escaping in laboratories. The filter is made up of a mesh of randomly arranged fiberglass fibers that catch large particles including the microscopic ones. HEPA filters are not only used in air filtration systems, but it has found great use and advantage in vacuum cleaners. The indoor air quality has greatly improved with the introduction of HEPA filter vacuum cleaners, because the technology has the efficacy of removing materials that are sources of allergy and asthma. For the conventional vacuum filters, they work like a sieve where small size particles, smaller than the sieve’s opening diameters, can pass through, of which in contrast HEPA vacuums do not do that, since they are designed to trap the smallest pollutants when air is forced through the fiberglass mesh, thereby, isolating the particles that will cling to the individual fibers. The utility advantage of the HEPA filter design and technology is that that it can remove 99.97% of all particles greater than 0.3 microns, so dust mites which is of 5 microns size and human hair of 40 micron size are basically trapped in the HEPA mesh and it just complies better to the government standards require that particle size with an equivalent to one-thousandth of a millimeter must be filtered out of the vacuum’s exhaust.
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Because of the proliferation of imitation HEPA filter vacuum cleaners in the market, the following are check guides to keep in mind so you can be sure that the vacuum cleaner you are purchasing contains a true HEPA filter: genuine HEPA filters must pass through government standard test and the test results are printed on the filter itself, including the MERV (Minimum Efficiency Reporting Value) rating, which is an evaluation system that rates a filter’s ability to remove particles from the air based on a scale of 1-20, to which the higher the rating the higher the ability of the filter to remove smaller particles.
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In addition, the HEPA filter unit must be sealed 100% so that there is no air flow around the filter to achieve an effective HEPA filtration system, which prevents large amounts of particles from re-entering the surrounding air. When another batch of dust particles return through the air flow, the HEPA filters can still trap these particles, thus preventing fewer microbe dust fragments from escaping in the exhaust. By preventing the emission of very minute impurities and other contaminants, like dust, smoke, mold, bacteria, and pollen, back into the air we breathe, the HEPA filter vacuum cleaner has proved its beneficial use in the home and office.