The energy equation is given by:
\[ \frac{P_1 - P_2}{\rho} = \frac{\Delta P}{\rho} = f \frac{L}{D_h} \frac{V^2}{2} \]
where $P_1$ and $P_2$ are the pressures at the inlet and exit, $\rho$ is the density of the air, $f$ is the friction factor, $L$ is the length of
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