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What Are ULPA Filters?
September 18, 2005
Filed under: Air Purifier Essential Reading — Administrator @ 1:18 pm
What are ULPA filters?..
ULPA filters otherwise known as Ultra-HEPA filters are the next level of air purification efficiency up from HEPA filters trapping 99.999% of air particles 0.3 microns and less from the passing air including smoke, pollen and dust. As a comparison to ULPA filters a standard HEPA filter will remove 99.97% of air particles 0.3 microns or less.
So what is a micron?..
The airborne particles captured by an air purifier is measured in size by microns. One micron is about 1/25,400 of an inch or roughly 100 times smaller than the width of a human hair. These particles are invisible to the human eye and require special magnifying machinery to be able to see them.