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which type of air purifier is good?



The HEPA filter is very necessary for air purifier.So a good air purifier  depends on the filters.First of all: what is a HEPA filter?

HEPA filters use dense, randomly arranged fibers to capture airborne particles from moving air. In fact,the particles will go through HEPA filter was  pulled  it out with the air flow. Their operation is very simple, but super efficient.

But Air purifiers have been developed for more than a century. The first air purification system appeared in the 1850s, it helped coal miners to use charcoal masks to remove toxic dust from their lungs.

Then, from the 1940s, the American Atomic Energy Commission began to test the high-efficiency particulate arrestance technology, now known as the HEPA. They want to find a way to protect soldiers from atomic radiation in the World War II .

Although HEPA has no effect on the filtration of radiation, but researchers soon found that filter could block out many harmful pollutants. In 1963, Manfred and Klaus Hames invented the  first residential air filter based on HEPA technology in the world. It helps reduce indoor pollution and chronic asthma symptoms. Now HEPA filters became so widespread that the U.S. Department of energy (DOE) required all HEPA filters can block at least 99.97% of air particles with a filter range of 0.3 microns.

The Moolan 5 in 1 Air Filter System is a true HEPA purifier which can clears out the dirty particles as small as 0.3 microns in the air, including pollen, household dust, pet dander and plant pollen and other allergens.