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What Is The Filtration Efficiency Of The Air Filter?

Oct. 23, 2019

Among the factors determining the filtration efficiency of the air filter, the meaning of the "quantity" of the dust is various, and thus the calculated and measured filter efficiency values are different. In fact, there is the total weight of the dust, the amount of dust particles; sometimes the amount of dust of a certain typical particle size, sometimes the amount of all dust; and the amount of light that is indirectly reflected by a specific method (colorimetric method), Fluorescence (fluorescence); an instantaneous amount of a certain state. There is also a weighted average of the efficiency values of the whole process of dusting.


So how is the filtration efficiency of the air filter measured? Clean Room Air Purifier Filter Supplier will come to tell you.


The same air filter is tested in different ways and the measured efficiency values will be different. Leave the test method. There is no way to filter efficiency.


The "filtration efficiency" of an air filter is the ratio of the amount of dust collected to the amount of dust in the original air:

Filtration efficiency = filter trapping dust / upstream air dust content = 1 - The downstream air dust content / upstream air dust content efficiency seems to be simple. However, its meaning and value are not as large as the test method.


Among the factors that determine the efficiency of filtration, the meaning of dust “quantity” is varied, and the calculated and measured filter efficiency values are also varied. In practice, there is the total weight of dust, the number of particles of dust; sometimes the amount of dust for a typical particle size, sometimes the amount of all dust; and the amount of light that is indirectly reflected by a specific method (colorimetric method), Fluorescence (fluorescence); an instantaneous amount of a certain state. There is also a weighted average of the efficiency values of the whole process of dusting.

Gasoline Filter For AUDI


Gasoline Filter For AUDI


The same air filter was tested in different ways. The measured efficiency values will be different. The test methods used by various countries and manufacturers are not uniform, and the interpretation and expression of air filter efficiency are quite different. Without the test method, there is no way to filter efficiency.


Historically, it was a group of people who were engaged in ventilation and clean room filters. Another group of people engaged in Automotive Air Filters, in addition to dust collectors. For liquid filtration, they use each method and say each efficiency. When air filter plants are mixed with automotive filters, or when dust collectors develop air filters, they themselves are inevitably confused by what they call filtration efficiency.


In order to save trouble and reduce misunderstanding, there have been some methods in foreign countries to express efficiency by code. These codes have not only clarified the test method, but also determined the efficiency index. Nowadays, filter manufacturers all over the world are crowding the Chinese market. In order to promote products to users of all backgrounds, they also use the efficiency logo as they please.


In addition, there is a “single fiber efficiency” in the filtration theory, which is a geometric definition that can be greater than 100%. A little careless, people who engage in theory will also confuse efficiency issues. In this chaotic situation, if you must know the specific air filter efficiency values, please don't forget to specify the specific test method and method of calculating efficiency.

The above is the method of calculating the filtration efficiency of the air filter. With this, the filtration efficiency can be calculated at any time. Finally, if you are interested in filter equipment such as air filters and car air filters, you can contact us, we can also provide you with the same quality fuel filter as Gasoline Filter For AUDI, you are welcome to buy.

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