HEPA Filter
Look at all the different brands in the market!!! All of them comes with promise of good air quality using all sorts of technology and chemical..But do they really work?
True HEPA filter
Opps! why 'True' ?
caused there are many look alike HEPA filters (also known as HEPA Type Filters) in the market. These are not True HEPA.
True HEPA must retain and filter out all particles from the air that passes through it down to 0.3 microns in size at an efficiency rating of 99.97% according to the U.S. Military Standard MIL-STD-282 (DOP test) as defined by Institute of Environmental Science
HEPA Type Filters have a efficiency of 25% to95% @ 0.3 microns in particle size.
HEPA=High Efficiency Particulate Arrestance
History
- developed during World War II by the Atomic Energy Commission
- purpose is to remove and capture 'escape' radioactive dust particles from the air
Facts
-CDC guidelines for the transmission of tuberculosis (TB) recommend HEPA filters with an efficiency of 99.97% tested at 0.3 microns particle size or smaller be used.
-recognized by OSHA / EPA
-recommended by U.S. Government’s Department of Homeland Security and FEMA
Use by
-Hospitals,
-laboratories
-NASA
-Clean room
Important Information
-HEPA filter bascially do not kill bacteria and virus unless the the environment is dry (no moisture), the bacteria and virus will 'dry' out. But HEPA filters can be chemically treated or with Ultra Violet light attachment to achieve the purpose.
-HEPA filter on its own is capable of capturing particles up to 0.3 microns effectively. Smaller than 0.3 microns, it is passed through.
U might wonder what is 1 micron?
measurement of length where 1 micron = 1 millionth of a meter
Cannot visualize?
anything less than 10 microns is not visible to the naked eyes
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