Duct Sizing Guides
Step-by-step methods, conversion tables and field rules of thumb for commercial duct design — each one with the matching calculator built in.
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How to Calculate Duct Size from CFM and Velocity
The duct sizing equation A = Q / V broken down step by step, with worked supply trunk and branch examples and a CFM to duct size chart.
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Round vs Rectangular Duct Sizing: Equivalent Diameter Explained
Huebscher equivalent diameter, what aspect ratio really costs in metal and pressure drop, and a round to rectangular lookup table.
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Flex Duct vs Rigid Metal Duct Sizing: Friction Rate Adjustments
Why flex runouts get undersized, the friction rate to design them at, and how much compression adds to the pressure drop.
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