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Air Purifier HEPA Filter
Jun 07, 2018

In these days of environmental pollutants, rampant over use of fossil fuels and an ever growing list of biological contaminants in the air, indoor air quality is more important than ever. Formerly regarded as necessary only for people with respiratory problems or allergies, high efficiency air purifiers have come to the forefront as critical tools in alleviating respiratory malfunction and preventing disease. Among these and others, air purifiers now serve a wide range of applications.

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Mechanical filters force air through a special screen that traps particles including allergens like pollen, pet dander, and dust mites. They also capture irritant particles such as tobacco smoke.


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The best-known mechanical filter is the high-efficiency particulate air (HEPA) filter. HEPA (which is a type of filter, not a brand name) was developed during World War II to prevent radioactive particles from escaping from laboratories.

To qualify as a true HEPA filter, a device must be able to capture at least 90% of all particles 0.3 microns or larger in diameter that enter it. There are filters on the market that claim to be HEPAs, but may not be as efficient, so look for a system that meets true HEPA filtration standards.

If your home is heated or air conditioned through ducts, it may be possible to build filters into your air handling system. A whole-house system will also save space and additional noise in your home. On the other hand, the filters may be more expensive and more difficult to handle, and they may need to be changed more often.