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About damec70

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  • From
    Malibu, CA
  • Porsche Club
  • Present cars
    2001 Porsche 911
  1. I've seen this misinterpretation on several forums and it's a common mistake. The "B2=20" single micron format reads differently than the multi-micron formats listed for standard filters (values are reversed). What it actually means is: "B2=20" -> "95% efficiency @ 2 microns" "2" = micron size & "20" = filtration ratio If you don't believe me, listen to the folks at Cummins filtration: "A Beta Ratio may be given for a filter as B10=50. This simply means that the Beta Ratio for 10 microns equals a ration of 50." That's from a Cummins technical training flyer dedicated to filter beta ratios, there's even a quiz question about this (#2). Feel free to take a look... Cummins Filtration Training Flyer
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