Chapter hvac engineering Fundamentals: Part 1 Introduction

5.2.1
Fan law equations
The fan law equations are used to predict the performance of a fan at
some other condition than that at which it is tested and rated. The
HVAC designer is particularly interested in the effects on horsepower,
pressure, and volume consequent to varying the speed of the fan in a
system.
Source: HVAC Systems Design Handbook
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