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ISO 4406 1987 counted at 2 particle sizes, 5 and 15 micron. ISO 4406:1999 counts at 3 sizes, 4, 6 and 14 micron. Loosely speaking, the 5 and 15 micron are loosely equivalent to 6 and 14 micron. So you could just read the particle counts at 6 and 14 micron. I would be interested to know why you don't change to ISO 4406:1999?
I hope this helps,
Matt.
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