I've not been able to find an answer to this, so if anyone has a source, please direct me there and we can just shut this thread down.
Finding an oil filters efficiency rating is rather easy as MOST manufacturers will post the ISO 4548-12 results. However, air filters don't seem to get the same treatment. I know that ISO 5011 exists, but I've not seen that actually cited on MANY air filters. A few examples of language can be found below. Does anyone have an answer as to why this hasn't been standardized like it has with oil filtration? Considering as how air filtration is far more important, it would seem like those numbers being readily available would be most beneficial to the consumer.
Fram EG - "2x engine protection"
Fram TG - "Traps double the dirt"
PureOne - "Traps upto 99% of damaging debris" (Based on ISO 5011 for A24278, no micron rating given)
STP - "Air filters are ISO 5011 tested to meet or exceed OEM fit and quality requirements"
Finding an oil filters efficiency rating is rather easy as MOST manufacturers will post the ISO 4548-12 results. However, air filters don't seem to get the same treatment. I know that ISO 5011 exists, but I've not seen that actually cited on MANY air filters. A few examples of language can be found below. Does anyone have an answer as to why this hasn't been standardized like it has with oil filtration? Considering as how air filtration is far more important, it would seem like those numbers being readily available would be most beneficial to the consumer.
Fram EG - "2x engine protection"
Fram TG - "Traps double the dirt"
PureOne - "Traps upto 99% of damaging debris" (Based on ISO 5011 for A24278, no micron rating given)
STP - "Air filters are ISO 5011 tested to meet or exceed OEM fit and quality requirements"
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