Kevin,

if possible, could you give me a general opinion on a filter that gets the following result on the ISO 4548 test:

Micron-Efficiency

9.5 - 50%

17.1 - 75%

22.2 - 90%

33.4 - 98.7%

34 - 99%

The results of the SAE standard testing also showed... Login to read more.