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ANSI Accredited Standards Developer Information

Fan Laws and System Resistance Curves

  • January 2026
  • Number of views: 1952
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Steve Back
New York Blower Company
Willowbrook, Illinois

The purpose of this article is to explain the basis and application of rules used to “estimate” fan performance for a fan installed in a duct system moving air when the speed of the fan is changed. With a basic understanding of these rules, the performance of a fan can be quickly calculated for various speed conditions.

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