(1)The "filtration efficiency" of an air filter is the ratio of the amount of dust captured through the filter to the amount of dust in the original air

(2)The determination of filtration efficiency is inseparable from the testing method, and different testing methods are used to test the same filter, resulting in different efficiency values. So without testing methods, filtering efficiency cannot be discussed.

(3)Different efficiency, different countries, different vendors use different testing methods. If you must know specific efficiency data, don't forget to specify specific test methods and methods for calculating efficiency.