Duct sizing doesn't stop at velocity, pressure drop matters. In this clip, Jonathan (co-founder at h2x) explains how pressure drop is calculated and why it directly impacts system efficiency and fan sizing. Once you know your flow rate and velocity, pressure drop is the next piece of the puzzle. He walks through the Darcy-Weisbach formula and the key factors: friction factor, duct length, velocity, and diameter. If you design duct systems, this step is critical. This clip is part of a full duct

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