Practice

A supply trunk run has $150\,\text{ft}$ of straight duct sized for a friction rate of $0.08\,\text{in. w.g. per }100\text{ ft}$, plus fittings whose loss coefficients sum to $\Sigma C=2.2$, all referenced to the duct velocity of $1{,}100\,\text{ft/min}$. For standard air, the total pressure loss of the run (in. w.g.) is most nearly:

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