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Since “low restriction” can mean “low filtration”, what is the micron filtration rating of Challenger/K&N air filters?

April 26, 2017air filters Challenger filtration mean Micron rating

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Since “low restriction” can mean “low filtration”, what is the micron filtration rating of Challenger/K&N air filters?

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Good question. Air filters are not rated by micron size on an absolute basis. (See technical service bulletin 89-5R from the Filter Manufacturer’s Council) The proper rating system for air filters is a testing procedure developed to measure the efficiency of the filtration media at varying micron sizes. Challenger/K&N reports that they routinely subject a sample of our air filters to this testing procedure conducted by independent laboratories. The primary purpose of this testing is to ensure that our air filter designs meet or exceed automotive industry standards. These filtration tests are performed in accordance with the Society of Automotive Engineer’s (SAE) J726 testing procedure.