There are different brands of air filter or air purifier in the market. How to different good air filter from normal one?
One reference is whether it is a HEPA air filter.
A pure HEPA air filter based on US Standards, it can screen 99.97 % of particulates that have a size of 0.3 micron.
For an excellent product of air purifier/air filter, please visit http://www.the-coway.com.
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