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That fan category is BV-3 and in the limits chart it is suggested "See ISO 10816-3".  When you go to that specification, specifically section 5, the logic behind setting limits is discussed extensively.  At least that is true in the version I have, the 1st edition dated 1998-05-15.  You'll find that many of the "steps" build on a 25% factor.

RM
Last edited by Registered Member

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