Re: K&N Air Filters........
Maybe you should go to some of the filter companies websites and see what they have to say, before opening your mouth.
Here I'll make it easy on you.
And here is actually test data of a ISO 5011 test. If you look through all the test data, charts and writing you will see they make no reference to "Microns".
Basically air filters are tested for the "capacity" of dirt they can hold.
Originally posted by chevy3100
Here I'll make it easy on you.
21. What is the micron rating and efficiency of a K&N air filter?
Air filters are not measured by micron size. As an industry standard, air filters are tested in accordance with the ISO 5011 test protocol to measure capacity (the physical amount of dust a filter can hold before cleaning is necessary) and efficiency (the filter's ability to trap and hold dust). See technical service bulletin 89-5R from the Filter Manufacturer's Council. The dust selected for the test contains a specified distribution of different particle sizes according to ISO standards.
Our testing has demonstrated that on average, K&N replacement air filters and air intake systems have a cumulative or Full Life filtration efficiency of between 96 and 99%. Different filters test at different efficiencies due to changes in their shape, surface area and relationship to the direction of air flow through the factory air box or test housing. Like most air filters available in the USA, our filters will provide all the engine protection you need.
Air filters are not measured by micron size. As an industry standard, air filters are tested in accordance with the ISO 5011 test protocol to measure capacity (the physical amount of dust a filter can hold before cleaning is necessary) and efficiency (the filter's ability to trap and hold dust). See technical service bulletin 89-5R from the Filter Manufacturer's Council. The dust selected for the test contains a specified distribution of different particle sizes according to ISO standards.
Our testing has demonstrated that on average, K&N replacement air filters and air intake systems have a cumulative or Full Life filtration efficiency of between 96 and 99%. Different filters test at different efficiencies due to changes in their shape, surface area and relationship to the direction of air flow through the factory air box or test housing. Like most air filters available in the USA, our filters will provide all the engine protection you need.
And here is actually test data of a ISO 5011 test. If you look through all the test data, charts and writing you will see they make no reference to "Microns".
Basically air filters are tested for the "capacity" of dirt they can hold.
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