v1.1.11

Static Regain Duct Sizer

Sizes a complete tree-shaped duct network by the static-regain method: the root trunk is set at a design velocity, then every downstream section is solved so the static regain from the velocity reduction pays for that section's friction, fitting and equipment losses. It identifies the governing worst-case path, hands back the fan duty, and draws the network as an interactive sketch.

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Last reviewed against the printed text · 1 September 2026

Walkthrough

2:28Static Regain Duct Sizer

Full walkthrough